Publication: Vibronic progressions in several diffuse interstellar bands

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Title	Vibronic progressions in several diffuse interstellar bands
Authors/Editors*	W. W. Duley, S. Kuzmin
Where published*	Astrophysical Journal Letters
How published*	Journal
Year*	2010
Volume	712
Number	No 1
Pages	L165-L168
Publisher	IOP
Keywords	Infrared spectrum carbon molecules
Link	http://iopscience.iop.org/2041-8205/712/2/L165/fulltext
Abstract	A number of vibronic progressions based on low energy vibrational modes of a large molecule have been found in the diffuse interstellar band (DIB) spectrum of HD 183143. Four active vibrational modes have been identified with energies at 5.18, 21.41, 31.55 and 34.02 cm-1. The mode at 34.01 cm-1 was previously recognized by Herbig (1988). Four bands are associated with this molecule, with origins at 6862.61, 6843.64, 6203.14 and 5545.11 Ã (14589.1, 14608.08, 16116.41, and 18028.9 cm-1, respectively). The progressions are harmonic and combination bands are observed involving all modes. We discuss the reason for the appearance of harmonic, rather than anharmonic terms in these vibronic progressions. We derive some constraints on the type and size of the molecule producing these bands from density functional calculations.