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Titolo:
Symmetry-breaking collisional energy transfer in the 4 nu(CH) rovibrational manifold of acetylene: spectroscopic evidence of a quasi-continuum of background states
Autore:
Payne, MA; Milce, AP; Frost, MJ; Orr, BJ;
Indirizzi:
Macquarie Univ, Dept Chem, Sydney, NSW 2109, Australia Macquarie Univ Sydney NSW Australia 2109 hem, Sydney, NSW 2109, Australia Macquarie Univ, Ctr Lasers & Applicat, Sydney, NSW 2109, Australia Macquarie Univ Sydney NSW Australia 2109 cat, Sydney, NSW 2109, Australia
Titolo Testata:
CHEMICAL PHYSICS LETTERS
fascicolo: 1-3, volume: 324, anno: 2000,
pagine: 48 - 56
SICI:
0009-2614(20000630)324:1-3<48:SCETIT>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
VIBRATIONALLY EXCITED ACETYLENE; DISPERSED FLUORESCENCE-SPECTRA; FERMI DYADS; RELAXATION; PATTERN; (C2H2)-C-12; PERTURBATIONS; FORMALDEHYDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Orr, BJ Macquarie Univ, Dept Chem, Sydney, NSW 2109, Australia Macquarie Univ Sydney NSW Australia 2109 ney, NSW 2109, Australia
Citazione:
M.A. Payne et al., "Symmetry-breaking collisional energy transfer in the 4 nu(CH) rovibrational manifold of acetylene: spectroscopic evidence of a quasi-continuum of background states", CHEM P LETT, 324(1-3), 2000, pp. 48-56

Abstract

Collision-induced molecular energy transfer in the 12 700 cm(-1) '4 nu(CH)' rovibrational manifold of acetylene is studied by infrared-ultraviolet double-resonance spectroscopy. As in previous work, there is evidence of (formally forbidden) odd-numbered changes in rotational quantum number J. Such 'symmetry-breaking' processes are invariant to choice of fluorescence-monitored vibronic band. The prominent (10300)(0) J = 12 rovibrational state appears to be a likely gateway and is rationalised in terms of a combination of quasi-resonant Coriolis and Stark mixing. An unusual collision-induced quasi-continuous background, underlying the discrete rovibrational states of the 4 nu(CH) manifold, offers a mechanistic key to the apparent symmetry breaking. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 22/09/20 alle ore 19:04:48