COLLECTIVE EXCITATIONS IN LIQUID METHANOL STUDIED BY COHERENT INELASTIC NEUTRON-SCATTERING

被引:26
作者
BERMEJO, FJ
BATALLAN, F
MARTINEZ, JL
GARCIAHERNANDEZ, M
ENCISO, E
机构
[1] UNIV COMPLUTENSE,FAC FIS,DEPT FIS MAT,E-28040 MADRID,SPAIN
[2] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE
[3] RUTHERFORD APPLETON LAB,FAC ISIS PULSED NEUTRON,DIDCOT OX11 0QX,OXON,ENGLAND
[4] UNIV COMPLUTUTENSE,FAC QUIM,DEPT QUIM FIS,E-28040 MADRID,SPAIN
关键词
D O I
10.1088/0953-8984/2/31/019
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Inelastic spectra of deuteromethanol measured by triple-axis neutron spectroscopy at several temperatures within the liquid range are reported. The observed scattering intensities are analysed in terms of reconstructions of the dynamical structure factor after deconvolution from instrumental effects, as well as model fits to the measured intensities. The data indicate the existence of a propagating high-frequency excitation, which at T=200 K becomes overdamped for wavevectors Q>0.6 AA-1. An insight into the nature of the observed excitation is given by the temperature behaviour of the damping factors. Such a trend gives additional support to the assignment of the excitation to closely packed patches of hydrogen-bonded molecules.
引用
收藏
页码:6659 / 6672
页数:14
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