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A Reinvestigation of the c3Π–X1Σ+ (0–0) Absorption Band of Carbon Monoxide

✍ Scribed by Jacob Baker; Françoise Launay; Michéle Eidelsberg; François Rostas

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
199 KB
Volume
203
Category
Article
ISSN
0022-2852

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✦ Synopsis

The forbidden c 3 ⌸-X 1 ⌺ ϩ (0-0) absorption band of carbon monoxide has been reinvestigated under different pressure conditions using the 10.7-m VUV spectrograph at Meudon. Overlap with the allowed C 1 ⌸-X 1 ⌺ ϩ (0-0) band at lower transition energy has been taken into account. We have identified a new rotational branch corresponding to an S-type branch and extended the analysis to both higher and lower J. An analysis of the band structure and the low J transition lines suggests that the band gains its intensity predominantly as a result of an interaction of the c 3 ⌸ state with a 1 ⌺ ϩ state, most likely the C 1 ⌺ ϩ (v ϭ 0) state. Molecular constants have been obtained for the c 3 ⌸ state that are in reasonable agreement with those previously published. The apparently anomalous small value for the centrifugal distortion constant is explained by a homogeneous perturbation with the k 3 ⌸ valence state.

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