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Titolo:
Observations of a quantum symmetry restriction in the rovibrationally inelastic scattering of glyoxal
Autore:
Clegg, SM; Parmenter, CS;
Indirizzi:
Indiana Univ, Dept Chem, Bloomington, IN 47405 USA Indiana Univ Bloomington IN USA 47405 ept Chem, Bloomington, IN 47405 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 45, volume: 104, anno: 2000,
pagine: 10265 - 10270
SICI:
1089-5639(20001116)104:45<10265:OOAQSR>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMOLECULAR VIBRATIONAL REDISTRIBUTION; ENERGY-TRANSFER; CROSSED-BEAM; S-1 GLYOXAL; ROTATIONAL-EXCITATION; POLYATOMIC-MOLECULES; EXCITED GLYOXAL; COMPETITION; COLLISIONS; ACETYLENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Parmenter, CS Indiana Univ, Dept Chem, Bloomington, IN 47405 USA Indiana Univ Bloomington IN USA 47405 mington, IN 47405 USA
Citazione:
S.M. Clegg e C.S. Parmenter, "Observations of a quantum symmetry restriction in the rovibrationally inelastic scattering of glyoxal", J PHYS CH A, 104(45), 2000, pp. 10265-10270

Abstract

Rovibrationally inelastic scattering of S-1 trans-glyoxal (CHOCHO, 12 modes) by H-2, D-2, and He is explored experimentally. Explicit attention is given to a state-to-state inelastic channel that is predicted to be forbiddenon account of quantum symmetry restrictions in the symmetric top approximation for glyoxal (kappa = -0.99). This channel is 0(0), K' = 0 --> 7', K' =0, where 0(0) is the S-1 zero-point level, 7(1) is the CHO-CHO torsional fundamental, and K' is the quantum number for angular momentum about the topaxis. After S-1 <-- S-0 pumping of the initial state, inelastic scatteringto the set of final states 7', K' = II that includes the <Delta>K' = 0 channel is monitored by dispersed fluorescence. Relative cross sections for the rovibrational transitions are obtained for inelastic scattering by H-2 (E-c.m = 650 and 1170 cm(-1)), D-2 (750 cm(-1)), and He (750 and 1220 cm(-1))to final states with K' ranging from 0 to 15. The predicted prohibition ofthe DeltaK' = 0 channel does not occur, but that channel is present with its scattering cross section reduced to only about half of the value expected if no symmetry effects were present. The partial relaxation of the quantum symmetry prohibition may plausibly be attributed to the small asymmetric top character of this near symmetric top molecule.

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Documento generato il 07/07/20 alle ore 21:54:01