A laser‐induced fluorescence study of the BiF A O+→X1 O+ system in the region 6550 to 7400 Å: Rotational analysis and evidence for an A O+ state potential maximum

Autor:	M. D. Oberlander, J. M. Parson
Rok vydání:	1993
Předmět:	Chemistry General Physics and Astronomy Diatomic molecule Bond-dissociation energy Dissociation (chemistry) symbols.namesake Franck–Condon principle Radiative transfer symbols Physical and Theoretical Chemistry Atomic physics Spectroscopy Laser-induced fluorescence Ground state
Zdroj:	The Journal of Chemical Physics. 99:2365-2376
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.465252
Popis:	Eighteen previously unobserved bands belonging to the BiF A O+→X1 O+ system have been identified in the region between 6550 and 7400 A. Nine bands representing v’=27–29 and v‘=40–45 have been rotationally analyzed, and the v’=27 and v’=29 states exhibit strong homogeneous perturbations. These upper state levels are also observed to predissociate, providing evidence for an A O+ state potential maximum which has been theoretically predicted. A limiting curve of dissociation suggests a rotationless potential maximum at 32 674±822 cm−1. This energy must correspond to a potential maximum if it is to be reconciled with recent thermochemical measurements of the ground state dissociation energy, D00=3.76±0.13 eV. The new spectroscopic constants have been included in a calculation of Rydberg–Klein–Rees potential curves for both states. Franck–Condon factors calculated from these potentials are qualitatively consistent with the observed intensity distribution. Measured collision free radiative lifetimes are consist...
Databáze:	OpenAIRE
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