Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apjs..169..472t&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 169, Issue 2, pp. 472-484.
Astronomy and Astrophysics
Astronomy
16
Astrochemistry, Ism: Clouds, Ism: Molecules, Methods: Laboratory, Molecular Data, Stars: Late-Type
Scientific paper
The C2 Swan system (d 3Πg-a 3Πu) was observed in emission for the Δv=-3 to Δv=+2 sequences in the 14,000-24,000 cm-1 spectral range using a Fourier transform spectrometer. We carried out a global simultaneous fit by including a wide range of vibrational states. A total of 34 bands with v'=0-10 and v''=0-9 were rotationally assigned. Numerous discrepancies were found in the assignments and in the measured transition wavenumbers between the new measurements and previous results. Most of the measured transition wavenumbers and their assignments for relatively low-v bands agreed with published data. On the contrary, for high-v bands our line positions and assignments disagreed with the tabulated literature values. In particular, the lines of six bands involving the levels with v'=4, 5, and 6 are almost completely different from the previous work. Major sources of the disagreement are thought to be line congestion and perturbations found in these bands. From the analysis, perturbations for v'=0, 1, 2, 4, 6, 8, 9, and 10 in the d 3Πg state were identified. A study of these rotational perturbations suggest that some of them are likely caused by interactions with high-v levels of the b 3Σ-g state.
Amano Takanobu
Bernath Peter F.
Hirao Takanori
Tanabashi A.
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