MODEL STUDY OF VIBRATIONAL-EXCITATION IN ELECTRON-POLYATOMIC MOLECULE COLLISIONS

被引:21
作者
GAUYACQ, JP
机构
[1] Lab. des Collisions Atomiques et Moleculaires, Univ. de Paris-Sud, Orsay
关键词
D O I
10.1088/0953-4075/23/17/017
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The effective range approximation, which has been limited to the treatment of electron-diatomic molecule interactions, is generalized to the case of electron-polyatomic molecule collisions. A model study of the vibrational excitation process is presented with the aim of recognizing features specific to the polyatomic targets. The model target molecule is modelled by a two vibrational mode molecule, one of the vibrational frequencies being very small to mimic a quasicontinuum of vibrational levels. It is found that the vibrational modes of the molecule cannot be treated independently, and that a resonance created by the motion along one coordinate can induce a vibrational excitation along another coordinate. This effect is analysed by looking at the time delay and time dependence of the vibrational excitation process. A significant production of low energy electrons is also observed in the resonance region, thus yielding an interpretation of the 'unspecific' vibrational excitation observed by Allan (1984,1988,1989) in large polyatomics.
引用
收藏
页码:3041 / 3056
页数:16
相关论文
共 21 条
[2]   VIBRATIONAL AND ELECTRONIC EXCITATION IN PARA-BENZOQUINONE BY ELECTRON-IMPACT [J].
ALLAN, M .
CHEMICAL PHYSICS, 1984, 84 (02) :311-319
[3]   (ALL-E)-1,3,5,7-OCTATETRAENE - ELECTRON-ENERGY-LOSS AND ELECTRON-TRANSMISSION SPECTRA [J].
ALLAN, M ;
NEUHAUS, L ;
HASELBACH, E .
HELVETICA CHIMICA ACTA, 1984, 67 (07) :1776-1782
[4]  
ALLAN M, 1988, 1KTH P INT C PHYS EL, P93
[5]   SELECTIVITY IN RESONANT VIBRATIONAL-EXCITATION BY E- IMPACT (0.3-4.5 EV) ON FORMALDEHYDE, ACETALDEHYDE AND ACETONE [J].
BENOIT, C ;
ABOUAF, R ;
CVEJANOVIC, S .
CHEMICAL PHYSICS, 1987, 117 (02) :295-304
[6]   VIBRATIONAL EXCITATION OF N2 BY RESONANCE SCATTERING OF ELECTRONS [J].
BIRTWISTLE, DT ;
HERZENBERG, A .
JOURNAL OF PHYSICS PART B ATOMIC AND MOLECULAR PHYSICS, 1971, 4 (01) :53-+
[7]  
DEMKOV YN, 1975, ZERO RANGE POTENTIAL
[8]   FRAME TRANSFORMATION EFFECTIVE-RANGE THEORY - APPLICATION TO INTERACTION OF POLAR-MOLECULES WITH ELECTRONS [J].
FABRIKANT, II .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1983, 16 (07) :1269-1282
[9]   SELECTION-RULES FOR VIBRATIONAL-ENERGY LOSS BY RESONANT ELECTRON-IMPACT IN POLYATOMIC-MOLECULES [J].
GALLUP, GA .
PHYSICAL REVIEW A, 1986, 34 (04) :2746-2750
[10]  
Gauyacq J-P, 1987, DYNAMICS NEGATIVE IO