COLLECTIVE LOW-FREQUENCY EXCITATIONS IN A MOLECULAR GLASS

被引：8

作者：

BERMEJO, FJ

CRIADO, A

GARCIAHERNANDEZ, M

ALONSO, J

PRIETO, C

MARTINEZ, JL

机构：

[1] UNIV SEVILLA,DEPT FIS MAT CONDENSADA,E-41080 SEVILLE,SPAIN

[2] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

[3] UNIV AUTONOMA MADRID,INST CIENCIA MAT,DEPT FIS APLICADA C4,E-28049 MADRID,SPAIN

[4] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE

[5] INST CIENCIAS MAT,E-41080 SEVILLE,SPAIN

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 02期

关键词：

D O I：

10.1088/0953-8984/6/2/012

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The collective dynamics of an organic molecular glass former has been investigated by means of coherent inelastic scattering of neutrons at several temperatures below the glass transition. The excitations observed by means of the inelastic neutron scattering response are characterized by the wavevector dependences of their average frequencies. The inelastic spectra are analysed on the basis of a lattice dynamics calculation for the polycrystalline reference state as well as a molecular dynamics simulation of a computer-generated glass. The excitation frequencies are discussed in terms of average omega(m) quantities, defined as the peak maxima of the longitudinal current-current autocorrelation function- An assessment of the reliability of the simulation results is finally made by comparison with the experimentally accessible magnitudes.

引用

页码：405 / 420

页数：16

共 30 条

[1] H-BOND IN METHANOL - A MOLECULAR-DYNAMICS STUDY [J].

ALONSO, J ;

BERMEJO, FJ ;

GARCIAHERNANDEZ, M ;

MARTINEZ, JL ;

HOWELLS, WS .

JOURNAL OF MOLECULAR STRUCTURE, 1991, 250 (2-4) :147-170

[2] COLLECTIVE EXCITATIONS IN LIQUID METHANOL - A COMPARISON OF MOLECULAR, LATTICE-DYNAMICS, AND NEUTRON-SCATTERING RESULTS [J].

ALONSO, J ;

BERMEJO, FJ ;

GARCIAHERNANDEZ, M ;

MARTINEZ, JL ;

HOWELLS, WS ;

CRIADO, A .

JOURNAL OF CHEMICAL PHYSICS, 1992, 96 (10) :7696-7709

[3] RAMAN AND FAR-INFRARED STUDY OF THE LATTICE-VIBRATIONS OF METHANOL [J].

ANDERSON, A ;

ANDREWS, B ;

MEIERING, EM ;

TORRIE, BH .

JOURNAL OF RAMAN SPECTROSCOPY, 1988, 19 (02) :85-89

[4]

BATHIA AB, 1986, MECHANICS DEFORMABLE, P94

[5] OBSERVATION OF HIGH-FREQUENCY EXCITATIONS IN A MOLECULAR GLASS [J].

BERMEJO, FJ ;

MARTINMARERO, D ;

MARTINEZ, JL ;

BATALLAN, F ;

GARCIAHERNANDEZ, M ;

MOMPEAN, FJ .

PHYSICS LETTERS A, 1990, 150 (3-4) :201-206

[6] HYPERSONIC RELAXATION IN LIQUID METHANOL [J].

BERMEJO, FJ ;

RAMIREZ, R ;

MARTINEZ, JL ;

PRIETO, C ;

BATALLAN, F ;

GARCIAHERNANDEZ, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1991, 3 (05) :569-576

[7] LOW-FREQUENCY EXCITATIONS IN A MOLECULAR GLASS - SINGLE-PARTICLE DYNAMICS [J].

BERMEJO, FJ ;

ALONSO, J ;

CRIADO, A ;

MOMPEAN, FJ ;

MARTINEZ, JL ;

GARCIAHERNANDEZ, M ;

CHAHID, A .

PHYSICAL REVIEW B, 1992, 46 (10) :6173-6186

[8] COLLECTIVE LOW-FREQUENCY EXCITATIONS IN A MOLECULAR GLASS [J].

BERMEJO, FJ ;

MARTINEZ, JL ;

GARCIAHERNANDEZ, M ;

MARTIN, D ;

MOMPEAN, FJ ;

ALONSO, J ;

HOWELLS, WS .

EUROPHYSICS LETTERS, 1991, 15 (05) :509-514

[9] INTERACTION OF SOFT MODES AND SOUND-WAVES IN GLASSES [J].

BUCHENAU, U ;

GALPERIN, YM ;

GUREVICH, VL ;

PARSHIN, DA ;

RAMOS, MA ;

SCHOBER, HR .

PHYSICAL REVIEW B, 1992, 46 (05) :2798-2808

[10] LOW-FREQUENCY MODES IN VITREOUS SILICA [J].

BUCHENAU, U ;

PRAGER, M ;

NUCKER, N ;

DIANOUX, AJ ;

AHMAD, N ;

PHILLIPS, WA .

PHYSICAL REVIEW B, 1986, 34 (08) :5665-5673

← 1 2 3 →