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Proceedings of the Second International Conference on

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Proceedings of the Second International Conference on Powered By Docstoc
					        Proceedings
            of the
           Second
        International
       Conference on



FHONON
PHYSICS
 August 26-31, 1985, Budapest
           Hungary

        Editors:
        J Kolldr
        NKroo
      N Menyhard
        T Siklos




     World Scientific
                                                                      ix

                              CONTENTS

Preface                                                              vii

PHONONS IN AMORPHOUS MATERIALS
M. CARDONA — Vibrational spectra of a-Si                               2
R.J. ELLIOTT —Vibrations in amorphous materials and
      at interfaces         ;                                         15
H.M. ROSENBERG — Phonons and fractons - a n experimental study ...    26
U. BUCHENAU — Low-frequency vibrations in amorphous
      materials                                                       30
G. WEISS — Low temperature acoustic properties of amorphous
      solids at audiofrequencies                                     35
R. VACHER, J. PELOUS and E. COURTENS - Light scattering
      observations of low-frequency vibrations in disordered
      systems                                                        40
V. ESTEVES, A. VANELSTRAETE and C. LAERMANS -Further study
      of the "glassy" behaviour of neutron irradiated quartz ....    45
H.v. LOHNEYSEN, E. RATAI and W. SANDER. - Tunneling states in
      vitreous silica: effect of structural relaxation               48
M. GULACSI and Zs. GULACSI - Phonon mediated spin-glass
      behavior in ZnCr, ,Gan .0.                                     51
                       1.6 0.4 4
A.M. de GOER and B. SALCE — Low temperature glass-like
      behaviour of neutron irradiated Ni-doped AI2O3 crystal ....     54
Y. DAGORN, R. VACHER, E. COURTENS and F. HUARD - Acoustic-
      phonon observations of freezing dynamics in a
      structural glass                                               57
A.G. ZHILICH, A.A. KISELEV and V.P. SMIRNOV -Phonons in
      orientationally disordered crystals                            60
W. BURCKHARDT, P. BUSSEMER and U. DIETRICH -Structural
      peculiarities in the optical properties of some
      chalcogenode glasses                                           63
M. WAGNER — Low temperature Fano limit of the phonon assisted
      quantum diffusion problem                                      66
M. DEVAUD and J.-Y. PRIEUR —Observation of ultrasonic free
      induction decay in a borate glass at low temperatures          69
A. RICHTER and W. POMPE - Qualitative features of Raman
      spectra in amorphous carbon films                               73
A. LOIDL and K. KNORR —Excitations in orientationally
      disordered crystals                                             77
F. GOMPF, G. FASOL, W. HONLE and J.B. SUCK - T h e phonon
      density of states of Hittorf'I phosphorus in compa-
      rison to those of the black orthorhombic and the red
      amorphous modifications: an inelastic neutron
      scattering investigation                                          82
Yu.M. GALPERIN, V.L. GUREVICH and D.A. PARSHIN -Nonlinear
      relaxational ultrasonic absorption in metallic
      glasses                                                           86
H.W. GRONERT and D.M. HERLACH -Phonon scattering by low
      energy excitations and free valume in amorphous PdCuSi     ....   89
J.D. COMINS, E.F. LAMBSON, W.A. LAMBSON, J.E. MACDONALD,
      G.A. SAUNDERS and B. BRIDGE - T h e elastic behaviour
      and vibrational anharmonicity of molybdenum phosphate
      glasses                                                           93
K. VLADAR — Ultrasound scattering on two-level systems in
      metallic glasses                                                  96
K. VLADAR and G.T. ZIMANYI -Electron-localisation effects
      on impurity dynamics                                              100
K. VLADAR, A. ZAWADOWSKI and G.T. ZIMANYI -Theory of a
      tunneling atom interacting with a degenerate electron
      gas                                                               103
S. PIEKARSKI —Quantum mechanical description of a linear
      elastic continuum with random properties                          108
T. SCHRADER, A. LOIDL, K. KNORR and J.K. KJEMS -Neutron
      scattering studies in the molecular glass
      (NaCN) l x (KCN) x                                                Ill

CALCULATION OF PHONONS
K.H. MICHEL — Phonons and orientational disorder in molecular
      crystals                                                          116
G.S. PAWLEY — T h e computer simulation of phase transitions            124
R.M. LYNDEN-BELL - Computation of phonons by molecular
      dynamics in orientationally disordered phases                     132
K. KUNC — T h e 'direct' methods in the ab initio theory
      of phonons                                                        137
J.T. DEVREESE, P.E. VAN CAMP and V.E. VAN DOREN - Ab-initio
      phonon frequencies of covalent semiconductors                     142
G.A. TOOMBS and F.W. SHEARD — T h e phonon dispersion relation
      for an insulating solid with an inhomogeneous
      distribution of paramagnetic ions                                 147
Z.K. PETRU — Anisotropy of isotope-scattering rate in
      crystals of hexagonal symmetry                                    150
                                                                        xi

    Ph. BUCHET and R.M. PICK -Analysis of a M.D. computation
          of a rotator phase                      *                    153
    C. PATEL, W.F. SHERMAN and G.R. WILKINSON -Lattice
          dynamics of cuprous bromide                                  156
    C. PATEL, W.F. SHERMAN and G.R. WILKINSON - Reinvestigation
          of lattice dynamics of diamond on the basis of
          extended versions of Born-von Karman model                   159
    V. FREI — A generalized lattice-dynamical frequency sum
          rule and beyond . .                                           162
    E.R. COWLEY, G.K. HORTON and J.G. LE"ESE -Phonons in rare
          gas solids at high temperatures                              165
    S. HAJAIG and M.A. BALL — Derivation of appropriate force-
          constants from experimental data                             168
    K.R. RAO, S.L. CHAPLOT, N. CHOUDHURY and S. GHOSE -
          Lattice dynamics of forsterite, Mg2SiO4                      171
    K.R. RAO and S.L. CHAPLOT — Lattice dynamics of complex
          ionic crystals                                               175
    A.N. LAZAREV, A.P. MIRGORODSKY and M.B. SMIRNOV -
          Vibrational spectra and dynamical properties of
          ionic-covalent crystals                                      179
    I.J. LALOV —Model for phonon dispersion in anisotropic
          crystals                                                     182

    ELECTRON-PHONON INTERACTION
    A.Yu. RUMIANTSEV —Singularities in phonon spectra in metals ....   188
    N.V. ZAVARITSKY — Electron-phonon interaction in 2D                196
    E. SIGMUND and J. MAIER — Phonon scattering at Jahn-Teller
           defects in semiconductors                                   201
    R. RIGHINI — Lattice dynamics and anharmonic properties
           of molecular crystals                                       206
    N.V. ZAVARITSKY - T h e phonon drag of electrons in metals         211
    P.R. SURJAN, H. KUZMANY and K. IWAHANA -Role of electron-
           phonon interaction in polyacetylene                         214
    A.N. KOCHARYAN —Effect of the electron-phonon interaction
           on the electron spectrum of the weakly disordered
           semiconductor                                               217
,   C.-C. WU — Influence of velocity operator on longitudinal
           magnetoacoustic phenomena in n-InSb                         221
     S.V. MESHKOV — Quasiclassical theory of multiphonon radiation-
           less transitions                                            224
xii

H. ESCHRIG, R. RICHTER, L. WEIB, A.Yu. RUMYANTSEV, N.L.
      MITROFANOV, A.S. IVANOV and N.A. CHERNOP^EKOV -
      Phonon anomalies in copper-base alloys                            227
C. WEBER, E. SIGMUND and M. WAGNER - A new Jahn-Teller
      phenomenon: dynamical valency-mixing in the system
      SmB 6 :Er 3+                                                      230
V. ZELEZNY, S. PACESOVA, J. PETZELT, V.V. KAMINSKII and
      I.A. SMIRNOV — F a r infrared reflectivity spectra of SmS   ...   233
B.Z. MALKIN, K.L. AMINOV, A.K. KUPCHIKOV, V.R. PEKUROVSKII
      and A.I. RYSKIN — Electron-phonon excitations in rare-
      earth crystals with zircon and scheelite structure                236
Yu.S. PONOSOV, G.A. BOLOTIN -Anomalous damping of the E 2
      optical phonon in transition metals                  ?            239
M.A. LEBJODKIN, S.N. ZORIN and V.S. BOBROV -Electron-phonon
      effects at a low-temperature twinning of niobium                  242
R. BESERMAN, K.P. JAIN, M.V. KLEIN and H. MORKOC -Electron-
      phonon coupling in mixed Ga x Al^ x As crystal                    245

INCOMMENSURATE AND STRUCTURAL PHASE TRANSITIONS
R. CURRAT —Neutron scattering studies of phase and
      amplitude modes                                                   250
T. JANSSEN — From incommensurate to quasi-crystals                      260
M. VALLADE — Low frequency phonon modes and the incommensurate
      phase of quartz                                                   266
R. MIGONI, H. BILZ, A. BUSSMANN-HOLDER and W. KRESS -
      Temperature dependence of ferroelectric soft modes                272
P. ECHEGUT, M.A. PIMENTA and F. GERVAIS -Hard modes in infrared
      response of ^SeO^-type incommensurate systems                     275
Y. LUSPIN, G. HAURET and P. ECHEGUT -Acoustic phonons
      investigation in NH^LiSO^ by Brillouin scattering                 278
P. SIMON, F. GERVAIS and P. ECHEGUT -Soft mode behavior
      induced by proton disorder in KDP-type compounds                  281
G.M. MAZZUCHELLI and R. ZEYHER -Static and dynamic properties
      of the intrinsically pinned phase of the Frenkel-
      Kontorova model at finite temperatures                            284
W. DULTZ — On the phase diagram of the alkali cyanides                  287
J.C. TOLEDANO, J. SCHNECK, G. ERRANDON^A, R. CURRAT and
      D. PETITGRAND —Neutron scattering and X-ray investi-
      gations of barium sodium niobate in the range of the
      quasi-commensurate phase                                          290
N. WRUK, H. FUTTERER, H. BACH, J. PELZL, K.-H. HO'CK and
      G.A. SAUNDERS —Acoustic anomalies near the structural
      transformation in La^S^                                           293
                                                                                          xiii

                               OE A O
E. MEIMARAKIS and P. T L D N — Renormalization-group study
      of s t r u c t u r a l and magnetic t r a n s i t i o n s associated with
      a six-component order-parameter                                                     296
    U S A NH L E
A. B S M N - O D R and H. BILZ - T h e phase t r a n s i t i o n
      mechanism of hydrogen bonded f e r r o e l e c t r i c s                            299
    TAC
D. S R U H and R. BECHER - T h e f e r r o e l e c t r i c phase t r a n s i t i o n
      in SnTe                                                                             302
F. PROKERT and S.V. MISYUL - Anticrossing of dispersion
      branches and exchange of eigenvectors in the elpasolite
      type crystal Cs2NaBiCl6              ,.                                            305
A.V. BELUSHKIN, I. NATKANIEC, N.M. PLAKIDA, L.A. SHUVALOV
      and J. WASICKI —Structural phase transitions in
      superionic conductors CsHSO. and CsHSeO^                                           308
P. TOLEDANO and M. CLIN -Theory of the magnetostructural
      phase transition in U0_                                                            312
D. PETITGRAND —Soft phonon and phase transition in RbFeBr,                               315
J.J.L. HORIKX, M.A.M. de JONG, J.I. DIJKHUIS, A.F.M. ARTS
      and H.W. de WIJN — Brillouin spectroscopy of
      Rb2ZnBr4 and Rb2ZnCl4                                                               318
N.N. BOGOLUBOV, Jr\, and V.N. PLECHKO -Higher orders of the
      perturbation theory for a polaron model at finite
      temperature                                                                         321
W. BUHRER, W. BRIXEL and H. SCHMID - Soft mode and structural
      phase transitions in the Perovskite Pb2CoWOg                                       325
N. WRUK, J. PELZL, K.-H. HOCK and G.A. SAUNDERS -High
      temperature elastic anomalies in A^BXg compounds due
      to coupling to the optical soft mode                                                328
C. AYACHE, M.D. NUNEZ-REGUEIRO, J.M. LOPEZ-CASTILLO - Thermal
      conductivity and charge-density-waves in dichalcogenides                         .. 331

PHONONS IN DISORDERED SYSTEMS AND INTERCALATED LATTICES

H. ZABEL — Phonons in intercalated graphite                                               336
P. BRUESCH — Phonons in superionic conductors                                             341
S.A. SOLIN —Phonons in ternary intercalated layered solids                                349

PHONONS IN NORMAL LIQUIDS AND MELTING

S.R. NAGEL, G.S. GREST and A. RAHMAN —Simulation spectroscopy
        of phonons in glasses                                                             354
A. SJOLANDER — Theory of liquid-glass transition                                          364
U. DAHLBORG, W. GUDOWSKI and K.E. LARSSON - Atomic motions in
      liquid metals by neutron inelastic scattering                                       372
XIV

L.A. de GRAAF, A.A. van WELL, P. VERKERK and I.M. de
      SCHEPPER — Sound modes in liquid argon and neon                    378
S.W. LOVESEY - Collective motions in dense fluids observed
      in neutron scattering                                              383

PHONONS IN MIXED VALENCE COMPOUNDS
P. FULDE - Interactions of phonons with 4f-electrons                     390
C. STASSIS -Phonon dynamics of d- and f-electron systems                 401
B. GOLDING, B. BATLOGG, D.J. BISHOP," W.H. HAEMMERLE,
       Z. FISK, J.L. SMITH and H.R. OTT -Sound propagation
       in heavy fermion superconductors                                  406
B. Ll)THI — Electron-phonon interaction in f-electron systems     ....   411
E. ZIRNGIEBL, S. BLUMENRODER, R. MOCK and G. G0NTHERODT -
       Relation of phonon anomalies to charge fluctuation
       rates in intermediate valence compounds                           413

NONEQUILIBRIUM PHONONS
Y. LEVINSON — Phonon propagation with frequency down-
       conversion                                                        418
R.S. MELTZER and R.M. MACFARLANE -Optical dephasing by
       nonequilibrium phonons in LaF,                                    425
W.E. BRON — Nonequilibrium phonon transport phenomena                    430
F.W. SHEARD, G.A. TOOMBS and S.R. WILLIAMS -Temperature
       and phonon distribution profiles for thermal transport
       through interfaces                                                435
A.F'.G. WYATT and M. BROWN — A model calculation of the quantum
       evaporation of ^He                                                440
A.S. ALEKSEEV, M.M. BONCH-OSMOLOVSKII, T.I. GALKINA - Non-
       equilibrium acoustic phonons in thin silicon layers               445
A.V. AKIMOV and A.A. KAPLYANSKII -Nonequilibrium phonons and
       exciton-phonon luminescence in cuprous oxide crystals             449
J. JANSZKY, A. MECSEKI and A.V. VINOGRADOV - Influence of
       non-equilibrium phonons on hot luminescence                       452
I. SILDOS, G. ZAVT and I. DOLINDO —Propagation of nonequili-
       brium phonons subjected to a resonance scattering
       by impurity molecules                                             455
N. RETZER, H. LENGFELLNER and K.F. RENK - Trapping time
       of phonons in strongly optically excited ruby                     458
U. HAPPEK, T. HOLSTEIN and K.F. RENK - Spectral-spatial
       diffusion of phonons in ruby                                      461
                                                                  XV

D.V. KAZAKOVTSEV and Y.B. LEVINSON -Film injectors of
      high energy phonons at different regimes of phonon
      propagation in crystals                                    464

NONLINEAR PHENOMENA
N. THEODORAKOPOULOS - Solitons: dynamics, statistics and
      the Bethe Ansatz                                           468
E. MAGYARI — Linear excitations of anharmonic crystals
      in the presence of domain walls                            478
H. BUTTNER — Thermal conductivity in one-dimensional
      classical lattices                                         483
R. SCHILLING - Glassy structures as spatial chaos                488
B.K. RHEE and W.E. BRON - Decay of coherent LO phonons
      in GaP                                                     493
N. FLYTZANIS, St. PNEVMATIKOS and M. PEYRARD -Emission of
      lattice waves due to discreteness of high energy
      solitons                                                   496
P. MOBIUS — Solitary excitations and their superposition         499
S.A. VITKALOV, V.F. GANTMAKHER and G.I. LEVIEV -Nonlinear
      acoustoelectronic effects under the conditions of
      supersonic drift of carriers in bismuth                    502

PHONONS IN SUPERLATTICES AND QUANTUM WELLS
J.M. WORLOCK - Phonons in superlattices                          506
B. JUSSERAND, D. PAQUET, F. ALEXANDRE, M.N. CHARASSE and
      A. REGRENY — Optical phonons in superlattices              521
J. SAPRIEL, J.C. MICHEL, J. CHAVIGNON, R. VACHER, A. LANGFORD
      and F. ALEXANDRE - N e w trends in the study of
      vibrational modes in superlattices                         526
S.R.P. SMITH —Theoretical modelling of phonons in
      superlattices                                              531
J.E. ZUCKER, A. PINCZUK, D.S. CHEMLA and A. GOSSARD - Exciton-
      optical phonon interactions in GaAs quantum wells          536
R. MERLIN, K. BAJEMA, R. CLARKE, F.-Y. JUANG and P.K.
      BHATTACHARYA - Fibonacci GaAs-AlAs superlattices           541
C. COLVARD, M.V. KLEIN, R. FISCHER and H. MORKOg -Experimental
      observations of folded acoustic phonons                    546
R. BESERMAN, V. GRIDIN, M.V. KLEIN and H. MORKOS -Electron-
      phonon coupling in superlattices                           548
E. VASS —Acoustic phonon limited electron heating in
      n-inversion layers                                         551
XVI

B. DJAFARI-ROUHANI, J. SAPRIEL, A. NOUGAOUI and
      L. DOBRZYNSKI —Elastic and photoelastic properties
      of superlattices of thin alternating layers                   555
J.O.A. IDIODI, B. DJAFARI-ROUHANI, L. DOBRZYNSKI,
      R. FOURET, J. SAPRIEL and F. BONOUVRIER -Simple
      molecular crystal models of surface, interface and
      superlattice vibrations                                       558
G.A. TOOMBS, F.W. SHEARD and L. EAVES -Tunnelling and
      optic phonon emission in n+GaAs/(AlGa)As/n"GaAs/n+GaAs
      devices                                                       561

SURFACE PHONONS

V. BORTOLANI and G. SANTORO —The theory of surface phonons
      in metal s                                                    566
J.P. TOENNIES —Helium atom time of flight spectroscopy of
      surface phonons                                               575
A. FLESZAR and R. RESTA — Interplanar and interatomic force
      constants in silicon and germanium                            583
G. SANTORO and A. FRANCHINI —Theory of reconstruction in
      clean and covered metallic surfaces                           589
F.W. de WETTE —Dynamics of noble gases adsorbed on graphite    .... 596
A.G. EGUILUZ, R.F. WALLIS and A.A. MARADUDIN -Surface
      phonons in simple metals                                      604
H. IBACH, W. DAUM, S. LEHWALD, M. ROCCA and T.S. RAHMAN -
      Studies of surface phonons by electron energy loss
      spectroscopy                                                  607
V. CELLI and D. EICHENAUER -The interaction of slow atoms
      with phonons at surfaces                                      612
A. MURAMATSU and W. HANKE - Many-body interactions and
      dynamical properties of semiconductor surfaces                617
B. FIREY and F.W. de WETTE —Restricted harmonic molecular
      dynamics: noble gases adsorbed on graphite                    624
C.S. JAYANTHI, H. BILZ and W. KRESS -Surface vibrations at
      (111) surfaces of the FCC noble metals - I. The
      pseudo-particle model                                         630
W. GOLDAMMER, W. LUDWIG and W. ZIERAU - Surface dynamics of
      diamond-structure crystals                                    633
D. NEUHAUS, F. J00 and B. FEUERBACHER - Surface phonons
      on Pt(lll)                                                    636
A.F. KHATER — Phonon scattering in rough surfaces                   639
J.E. BLACK -Atom vibration at the (110) surface of FCC
      metals                                                        642
                                                                 XVII

W.M. ROBERTSON, A.L..MORETTI and R. BRAY - Surface plasmon
      scattering by surface acoustic waves on thin silver
      films                                                      647
P.A. THIRY, M. LIEHR, J.J. PIREAUX, R. CAUDANO, Ph. LAMBIN,
      J.P. VIGNERON and A.A. LUCAS —Optical surface phonons
      of dielectric materials investigated by high
      resolution electron energy loss spectroscopy               650
U. SCHRODER, F.W. de WETTE and W. KRESS -Relaxation of
      (0,0,1) surfaces of alkali halides, MgO and incipient
      ferroelectric IV-VI compounds                              653
J. THROWE, F.M. LURIE and W.E. BRON -Effect of surface
      preparation on phonon reflection in silicon                657
D.P. JOUBERT — Interatomic force constants and the re-
      construction of transition metal surfaces                  660
R. HAUG, E. SIGMUND and K. WEISS - A model for the phonon
      transmission at a liquid-helium solid interface
      including surface roughness                                663
T.S. RAHMAN and H. IBACH - Lattice dynamics of adsorbate
      induced reconstruction of Ni(100)                          666
R. REIGER, J. PRADE, U. SCHRODER, W. KRESS and F.W. de WETTE -
      Dynamics and relaxation of (001) surfaces of
      perovskites                                                669
M. TOMASEK — Origin of instability and reconstruction of
      the W(001) surface                                         673
C.G. EDDISON and M.N. WYBOURNE -Thermal phonon boundary
      scattering at sapphire surfaces                            677
T. SEKINE, J.-I. WATANABE, K. UCHINOKURA and E. MATSUURA -
      Raman scattering and infrared reflectivity by surface
      phonon polariton on gratings of GaP                        680

PHONONS AND POINT DEFECTS IN CRYSTALS
V.W. RAMPTON and M.K. SAKER - T h e acoustic paramagnetic
      resonance of Li ions in Si                                 684
V.G. KVACHADZE, M.G. ABRAMISHVILI, T.L. KALABEGISHVILI and
      V.I. ALTUKHOV —Resonance scattering of phonons on
      F- and Fj-centers in ionic crystals                        687
G. PUNZ and J. HAFNER - Local environment effects in the
      phonon spectra of subsitutionally disordered alloys        690
S.S. YOM, R.S. MELTZER and J.E. RIVES -Resonant Raman
      scattering of 23 cm phonons by Dy ions in LaFj             693
J.B. PAGE and M. PORTNEY —Theoretical Raman studies of the
      perturbed phonons of U-centers                             696
xviii

R.J.G. GOOSSENS, J.I. DIJKHUIS and H.W. de WIJN - Exchange-
      invoked relaxation of 29 cm"-'- phonons in ruby              699
G. SOLT and H. BECK —Change in the interatomic forces in
      the neighbourhood of an impurity                             702
Yu.E. PERLIN — Multiphonon relaxation of local electronic
      states in crystals                                           705
P. BUSSEMER — Localized electron interaction with many
      phonons: optical absorption and Urbach-tail                  708
A.S. BAKAI and N.P. LASAREV - T h e mechanisms of effect of
      sound on diffusion in solids .'.                        :. . 711
D.N. TALWAR and M. VANDEVYVER -Gallium isotope fine structure
      of boron antisite defect centers in GaAs                     714
G.I. PILIPENKO, F.F. GAVRILOV, O.I. TYUTYUNNIK, D.V. OPARIN
      and V.I. TYUTYUNNIK - Investigation of phonon states
      and electron-phonon interaction in lithium hydride
      by optical spectroscopy                                      717
N. BUTLER, J. JOUGLAR, B. SALCE, L.J. CHALLIS and
      P.L. VUILLERMOZ — Anisotropic stress dependence of
      phonon scattering by Cr 3 + in GaP and InP                   720
A.P. HERAUD, L.J. CHALLIS and A.A. GHAZI - Investigation of
      V^ + pairs in AI2O3 by phonon spectroscopy                   723
M. GRYNBERG and J.-Y. PRIEUR -Comparative ultrasonic study
      of CdTe and Cd Q 3 7 M n 0 6 3 Te                           726

PHONONS IN LOW-DIMENSIONAL SYSTEMS
T. NAKASHIZU, T. SEKINE, K. UCHINOKURA and E. MATSUURA -
      Raman scattering in layered compound 4Hb-TaSe2              732
T. SEKINE, M. IZUMI, K. UCHINOKURA and E. MATSUURA - Raman
      scattering by amplitude modes in quasi-one-dimensional
      conductors, ( TaSe,j)2I and (NbSe,^) 10/3*                   735
M.N. WYBOURNE, B.J. KIFF, D.N. BATCHELDER, D. GREIG and
      M. SAHOTA — Anisotropy of the thermal conductivity
      of polydiacetylene single crystals                          738
M.S. BRODIN, I.V. BLONSKII and B.M. NITSOWICH - Lifshits-
      Komatsu effect in low-dimensional structures                741
F.G. MERTENS —Phonons in linear chain models with
      strongly anharmonic interactions                            744
S.G. ABDULLAEVA and N.T. MAMEDOV -Peculiarities of phonon
      spectra and thermal properties of complex layered
      crystals                                                    747
                                                                   XIX

E. BONJOUR, R. CALEMCZUK, A.F.- KHODER, P. GOUGEON,
      M. POTEL and M. SERGENT - Influence of different
      cations (M) on the specific heat of quasi one-
      dimensional ternary compounds M.Mo^Se,                       750
K.J. BRITTON, M.A. BROWN and M.N. WYBOURNE -Direct thermal
      expansion measurements of a polydiacetylene single-
      crystal perpendicular to the carbon chain direction          753
G.-A. RACINE, F. PATTHEY, P. HERRMANN, P. MARTINOLI and
      H. BECK — Dynamics of commensurate, incommensurate
      and liquid-like vortex phases in 2-d superconductors         756
V.M. AGRANOVICH, P. BUSSEMER, Yu.N. GARTSTEIN and
      A. ZAKHIDOV — Internal structure of charge-transfer
      excitons: dimers and trimers                                 759
P. BUSSEMER, E. JAGER, M. MOSSA and G. PETER - Biphonons
      in linear anharmonic chains                                  762
M.V. BELOUSOV, B.E. VOL'F, E.A. IVANOVA and D.E. POGAREV -
      Experimental and theoretical study of density of
      states in quasi one-dimensional alloys                       765
K. CARNEIRO, J.S. PEDERSEN and M. ALMEIDA - Phonons in two
      molecular conductors measured by inelastic neutron
      scattering                                                   768
Y. HIKI, T. MUGISHIMA, Y. KOGURE and K. KAWASAKI -
      Thermal diffusivity in polyethylene determined by
      laser-pulse method                                           771
K. IWAHANA, H. KUZMANY and S. ROTH -Optical phonons of a
      bond-alternated zig-zag chain                                774
N.E. MASSA, S. JANDL, A. CAILLE and M. BANVILLE - F a r infrared
      spectra of unidimensional ferromagnet CsNiF3                 777
I.P. IPATOVA, A.V. SUBASHIEV and V.A. SHCHUKIN - T h e
      spectrum of optical phonons in ionic crystals with
      one-dimensional disorder                                     780
0. BRAFMAN, E. EHRENFREUND and Z. VARDENY -Amplitude modes
      and disorder in polyacetylene                                783

INTERACTION OF PHONONS WITH EXTERNAL FIELDS
V.V. LAVRIK, L.N. OVANDER and V.T. SHUNYAKOV -Raman
      scattering in crystals at polar phonons                      788
E.M. IOLIN, I.R. ENTIN, V.N. GAVRILOV, E.V. ZOLOTOYABKO,
      B.V. KUVALDIN, E.A. RAITMAN and I.P. SMIRNOVA - T h e
      influence of high frequency ultrasonic waves on the
      dynamical diffraction of neutrons, X-ray and
      Mbssbauer radiation                                          791
XX

E. LIAROKAPIS, G.A. KOUROUKLIS and E. ANASTASSAKIS -
      The phonon spectrum of LaF3 under high temperature
      and pressure                                                 794
H.E. JACKSON and R.T. HARLEY - Quasielastic light scattering
      from diamond: the evolution of entropy-fluctuation
      scattering                                                   797
V.F. BOLDYSHEV and M.J. KONCHATNYJ -Electromagnetic con-
      version of phonons by interaction with relativistic
      charged particles                                            800
B. SALCE and L.A. BOATNER —Static el-ectric field effects
      on thermal conductivity of pure KTaO3 and KTai_ x Nb x 0 3
      crystals                           ;                         804
J.E. DMOCHOWSKI - Multiphonon absorption edge of CdF 2             807
M.Ya.VALAKH, I. KOSACKI, A.P. LITVINCHUK and Yu.M. AZHNYUK -
      The phonon spectra and superionicity of pure,
      doped and mixed PbF2-type crystals                           810
M.P. LISITSA and M.Ya. VALAKH —Phonon resonances in pure
      and mixed A 2 B 6 crystals                                   813
M.V. BELOUSOV, R.M. SARDARLY and K.R. ALLAKHVERDIEV -
      Investigation of density of phonon states in T1S
      and TISe crystals by Raman spectroscopy                      816

ANHARMONIC INTERACTIONS IN QUANTUM LIQUIDS AND SOLIDS
D. PINES —Elementary excitations in the helium liquids             820
W.G. STIRLING — N e w high-resolution neutron scattering
      investigations of excitations in liquid helium-4             829
A. SZPRYNGER and M. LUCKE - Dynamic structure factors
      and neutron scattering spectra of liquid ^He - ^
      mixtures                                                     836
H.J. LAUTER, H. GODFRIN and H. WIECHERT - Excitations in
      4
        He-films                                                   842
Y. HIKI and F. TSURUOKA -Ultrasonic studies of solid
      helium-4                                                     850
L.P. MEZHOV-DEGLIN -Phonon scattering in solid helium-4            855
A.A. LEVCHENKO and L.P. MEZHOV-DEGLIN - Phonon scattering
      on dislocations in deformed He crystals                      859
S.B. OTA - Band Jahn Teller effect and superconductivity
      in A15 compounds                                             862
A.I. GOLOV, V.B. EFIMOV and L.P. MEZHOV-DEGLIN -Motion
      of positive ions in HCP 4 He                                 865
                                                                 xxi

I.J. LALOV — Two-phonon spectra: anharmonic modulation and
      manifestation                                              868

METHODS OF PHONON GENERATION AND DETECTION
T.C. GUO, W.W. GUO and L.E. LARSEN — Thermoacoustic genera-
      tion in dielectrics induced by microwave pulses            874
S. PRANTS — Backward-wave dislocational phonon echoes            877
H. SCHWARTZ and K.F. RENK -Study of very high frequency
      acoustic phonons in diamond generated by defect-
      induced one-phonon absorption                              880
W.E. BRON, J. KUHL and B.K. RHEE -Generation and detection
      of coherent optical phonons                                883
V.V. SAMARTSEV, U.S. IVANOV, S.N. ANDRIANOV and
      U.E. SHEIBUT — Phonon-photon superradiance                 888
W. SCHNEIDER, R. BAYERER and J. HEBER -Electron-phonon
      interaction of the 5 D4 crystal — field levels of
      Tb 3 + in yttrium aluminium garnet (YAG)                   891
A. PUSHPAHASAN and K.S. VISWANATHAN - Focussing and de-
      focussing of ballistic phonons in diamond and
      Nb3Sn                                                      894
T. JUHASZ, J.S. BAKOS and Cs. KUTI -Coherent optical
      generation and time resolved detection of phonons
      in calcite                                                 897
U. KOPVILLEM and E. HOLODKEVICH - Nonresonant phonon
      echoes and avalanches                                      900
U. KOPVILLEM and E. HOLODKEVICH - Pseudomagnetic acoustic
      neutron and muon resonances                                903
M. REIFFERS, P. SAMUELY, K. FLACHBART, S. JANOS, A.I. AKIMENKO
      and I.K. YANSON — Point-contact spectroscopy of
      Cu at 0,7 K                                                906
N.A. TULINA, Yu.A. SHITIKOV and M.G. ZEMLYANOV -Electron-
      phonon interaction and phonon spectrum of rhenium          909
N.A. TULINA — T h e peculiarities of the electron-phonon
      interaction in rhenium defected systems                    912

PHONONS IN SEMICONDUCTORS
M. SCHARLI, W. BUHRER and F. LEVY - Inelastic neutron
      scattering and lattice dynamics of HfSe2» SnSe 2 and
      TiS                                                        918
P. CIEPIELEWSKI, I. GREGORA and V. VORLICEK -Raman
      scattering of Cd^_ x Mn x F 2 mixed crystals .... ;        921
xxii

P.P. LOTTICI, A. PARISINI, C. RAZZETTI and G. ANTONIOLI -
      Zincblende-like phonons in mixed defect chalcopyrite
      semiconductors                                            924
C. PATEL, K.A. MASLIN and T.J. PARKER -Study of lattice
      anharmonicity in ZnSe by dispersive Fourier transform
      spectroscopy                                              927
A. FLESZAR, K. KUNC, R. RESTA and E. TOSATTI -Crucial
      role of exchange and correlation in lattice
      dynamics of germanium                                     930
G. KANELLIS, W. KRESS and H. BILZ ^ Dynamical and optical
      properties of Cu-halides                                  933
E. HARO and M. BALKANSKI, K.H. WANSER and R.F. WALLIS -
      Anharmonic effects in the Raman spectrum of silicon       937
D. STRAUCH and B. DORNER —Phonon eigenvector determination
      in GaAs at the X and L points                             940
K. KUNC and Ph. HAGEGE - Lattice vibrations along (111) in
      gallium arsenide studied by the density functional
      method                                                    943
S. BARONI and R. RESTA — Ab initio calculation of the
      Raman tensor in silicon                                   946
O.H. NIELSEN — Optical phonons and elasticity of diamond
      at megabar stresses: ab-initio calculations               950
G.P. SRIVASTAVA and K. KUNC -Phonons in germanium along the
      (110) direction: 'direct' approach                        953
N. CHURCHER, K. KUNC and V. HEINE -Dynamical properties
      of silicon carbide: ab-initio calculations                956
W. METZGER and R.P. HUEBENER —Phonon focusing in Ge and Si
      imaged by electron beam scanning                          959
C. FALTER, W. LUDWIG and M. SELMKE -Microscopic theory of
      lattice dynamics applied to Si, Ge, GaAs                  962
T. SOTA and K. SUZUKI —Ultrasonic attenuation of doped
      semiconductors in the weak localization regime —
      the effect of magnetic fields                             965
M. KOHNO, K. ASANO and K. SUZUKI - Sound velocity measurement
      in Sb-doped Ge near the metal-nonmetal transition         968
P.G. DACOSTA and K. KUNC —First-principle force constants
      and lattice dynamics of germanium                         971

INTERACTION OF PHONONS WITH OTHER EXCITATIONS, PRESSURE
AND TEMPERATURE EFFECTS
S.A. LEE, D.A. PINNICK, S.M. LINDSAY and R.C. HANSON -
      Brillouin studies of solid HF at high pressure            976
                                                            XXIII

B. SALCE, R. CALEMCZUK, E. BONJOUR, R.L. MIGONI and
      L.A. BOATNER — Low temperature thermal properties
      of KTaO 3 and KTa 9? Nb Q 3 0 3                       979
A.V. BELUSHKIN, I. NATKANIEC, T. WASIUTYNSKI and
      J. WASICKI -Phonons in biphenyl and 4,4'-
      difluoro-biphenyl crystals                            982
M. DAHL and G. SCHAACK — Davydov-splitting and interionic
      interaction in PrFj                                   985
C. RAPTIS and E.W.J. MITCHELL —Temperature dependence of
      phonon spectra in alkali halide* crystals             988
B.P. ANTONYUK, P. BUSSEMER and L. LEINE - Exciton
      luminescence due to strong laser fields: nonlinear
      temperature behaviour and bistability                 991
Author Index                                                993

				
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