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Titolo:
Classical characters of highly excited bend dynamics of acetylene in two coupled SU(2) coset spaces
Autore:
Yu, J; Wu, GZ;
Indirizzi:
Tsing Hua Univ, Dept Phys, Educ Minist, Mol & Nano Sci Lab, Beijing 100084, Peoples R China Tsing Hua Univ Beijing Peoples R China 100084 ng 100084, Peoples R China
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 2, volume: 113, anno: 2000,
pagine: 647 - 652
SICI:
0021-9606(20000708)113:2<647:CCOHEB>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMOLECULAR VIBRATIONAL REDISTRIBUTION; EMISSION PUMPING SPECTROSCOPY; DISPERSED FLUORESCENCE; APPROXIMATE CONSTANTS; RESONANCE-SPECTRA; INTERNAL ENERGY; STATE; CM(-1); ASSIGNMENT; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, GZ Tsing Hua Univ, Dept Phys, Educ Minist, Mol & Nano Sci Lab, Beijing100084, Peoples R China Tsing Hua Univ Beijing Peoples R China 100084 84, Peoples R China
Citazione:
J. Yu e G.Z. Wu, "Classical characters of highly excited bend dynamics of acetylene in two coupled SU(2) coset spaces", J CHEM PHYS, 113(2), 2000, pp. 647-652

Abstract

The classical characters of the highly excited bend dynamics of acetylene are analyzed in terms of two coupled SU(2)/U(1) coset spaces corresponding to the right and left circular motion of the two C-H bends. The vibrationalmodes show a wide variety of behaviors that are not observed in the simpleSU(2)/U(1) coset case which deals with, e.g., two coupled stretches, in which case the vibrational modes can be characterized as (low-lying) local and (high-lying) normal modes with a so-called local-normal transition in between. For the two coupled SU(2)/U(1) cosets of acetylene, the general trendis that most modes are perturbed local or normal modes, with distinct characters that are not found in the SU(2) dynamics. Details of their classicalcharacters and the dynamical action flow between the two C-H bends were deduced. When the total action number N-b is small (less than 14), normal mode motions dominate, i.e., trans bend modes at the bottom of each polyad andcis bend at the top. At higher N-b, the vibrational modes are more or lessof local character though they, individually, do possess very unique characters. Specifically, as N-b ranges from 12 to 22, the characters of the low-lying levels change from the trans character with action asymmetrically distributed in the two C-H bonds to one hydrogen bending, while those of the high-lying levels change from well concerted cis to local counter rotation. These results are consistent with recent quantal and semiclassical results. [M. P. Jacobson, R. J. Silbey, and R. W. Field, J. Chem. Phys. 110, 845 (1999); M. P. Jacobson, C. Jung, H. S. Taylor, and R. W. Field, ibid. 111, 600 (1999)]. (C) 2000 American Institute of Physics. [S0021-9606(00)02026-2].

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Documento generato il 15/07/20 alle ore 08:50:38