| Autor: |
S.Paddi Reddy, C.V.V. Prasad, G. L. Bhale |
| Rok vydání: |
1987 |
| Předmět: |
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| Zdroj: |
Journal of Molecular Spectroscopy. 121:261-269 |
| ISSN: |
0022-2852 |
| DOI: |
10.1016/0022-2852(87)90049-x |
| Popis: |
The third positive system ( b 3 Σ + - a 3 Π r ) and the three Kaplan bands of 12 C 16 O occurring in the spectral region 2500–3830 A are reinvestigated. In addition to the previously known bands, five new bands of 12 C 16 O are observed. Kaplan bands and the five new bands are now assigned as the ν ″ progression with ν ′ = 2 ( ν ″ = 0 to 3 and 5 to 8) of the third positive system. The corresponding bands of 13 C 18 O are also observed for the first time. The new vibrational assignments of 12 C 16 O are confirmed from the calculated Franck-Condon factors and the data obtained for the bands of 13 C 18 O. The derived molecular constants (in cm −1 ) for the b 3 Σ + - a 3 Π r system of 12 C 16 O are ν e =34 999.7 9 ±1.6 ω ′ e =2333.9 0 ±2.1; ω ″ e =1738.2 6 ±0.6; ω ′ e χ ′ e =58.6 4 ±0.7 ω ″ e χ ″ e =14.2 5 ±0.1. The corresponding constants of 13 C 18 O are ν e =35 000.3 1 ±2.0 ω ′ e =2220.0 9 ±2.6; ω ″ e =1655.2 9 ±0.7; ω ′ e χ ′ e =52.1 9 ±0.8 ω ″ e χ ″ e =12.8 2 ±0.1. The identification of the ν = 2 level of the b 3 Σ + state favors the “higher” value of 89 460 cm −1 for the dissociation limit, rather than the “lower” value ≤ 88 262 cm −1 , existing in the literature. The present work correctly interprets the Kaplan bands of CO after their first observation in 1930. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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