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Titolo:
VIBRATIONAL-RELAXATION AND ENERGY LOCALIZATION IN POLYATOMICS - EFFECTS OF HIGH-ORDER RESONANCES ON FLOW-RATES AND THE QUANTUM ERGODICITY TRANSITION
Autore:
LEITNER DM; WOLYNES PG;
Indirizzi:
UNIV ILLINOIS,DEPT CHEM,1209 W CALIF ST URBANA IL 61801
Titolo Testata:
The Journal of chemical physics
fascicolo: 24, volume: 105, anno: 1996,
pagine: 11226 - 11236
SICI:
0021-9606(1996)105:24<11226:VAELIP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOPOLOGICALLY DISORDERED-SYSTEMS; RANDOM-MATRIX TREATMENT; ANDERSON LOCALIZATION; REDISTRIBUTION; MOLECULES; DIFFUSION; DYNAMICS; 1-BUTYNE; SPECTRA; ETHANOL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
D.M. Leitner e P.G. Wolynes, "VIBRATIONAL-RELAXATION AND ENERGY LOCALIZATION IN POLYATOMICS - EFFECTS OF HIGH-ORDER RESONANCES ON FLOW-RATES AND THE QUANTUM ERGODICITY TRANSITION", The Journal of chemical physics, 105(24), 1996, pp. 11226-11236

Abstract

That high-order resonances may be involved in determining rates of vibrational relaxation in highly excited molecules has been recognized for some time. In this paper, high-order resonances are shown to play acentral role in establishing the transition to ergodic flow, which wecall the quantum ergodicity transition, at low energy in many-dimensional systems. The location of the transition to global vibrational flow in a system of coupled nonlinear oscillators is found to be generally sensitive to high-order resonances. On the other hand, except immediately above the transition, rates of flow once established depend primarily on the familiar low-order terms until the molecule reaches much higher excitation. Both the orders of resonant coupling terms in the vibrational Hamiltonian important in determining the transition to ergodicity, and the orders relevant for determining vibrational relaxationrates in large molecules are found to scale in a simple way with the strength of resonant coupling terms and the size of the molecule. (C) 1996 American Institute of Physics.

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Documento generato il 28/09/20 alle ore 18:38:40