à 1B2–X̃ 1A1 26v0 transitions of 18O‐enriched tropolone

Autor:	Robert W. Field, Martin A. Hunter, Richard L. Redington, Theresa E. Redington
Rok vydání:	1990
Předmět:	Analytical chemistry General Physics and Astronomy Molecular physics Tropolone Isotopomers chemistry.chemical_compound symbols.namesake chemistry Franck–Condon principle Excited state Atom Kinetic isotope effect symbols Vibronic spectroscopy Physical and Theoretical Chemistry Tropone
Zdroj:	The Journal of Chemical Physics. 92:6456-6462
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.458325
Popis:	Laser excitation spectra with v=0, 2, 4, and 6 in the A 1B2–X 1A1 26v0 progression of jet‐cooled 18O/16O isotopomers of tropolone are reported. The isotope shift for ν26, an out‐of‐plane deformation mode at 39 cm−1 in the A state, is 2% for tropolone‐18O18O. This large 18O isotope effect indicates that Q26 for tropolone resembles the analogous normal mode of tropone, which is a ring deformation towards the boat conformation of 2, 4, 6‐cycloheptatriene accompanied by a large O atom displacement. Tunneling by tropolone in the A state is quenched by exciting the 26v overtone states and a mechanism for this quenching is proposed in terms of the indicated normal coordinate. Tunneling splittings are
Databáze:	OpenAIRE
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