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Assessing the accuracy of the vibrational sudden approximation in collinear atom + triatomic molecule collisions

✍ Scribed by J.W. Askew; S.R. McIntyre; G.A. Pfeffer

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 419 KB
Volume: 209
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)87222-o

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✦ Synopsis

Exact and vibrational sudden approximation (VSA) transition probabilities for He+ HIZ, Be&, BeBr, and CO2 at 0.5 to 3.0 eV are calculated and compared. The agreement between the VSA and the exact results for the excitation of the symmetric stretch is excellent for HI2 (even for large changes in the vibrational quantum number), degrades slightly on going to BeI, and again to BeBr* and becomes unacceptable for the CO2 case. These trends are in accord with previous validity criteria. The agreement for the excitation of the asymmetric stretch is only qualitatively correct.

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