Electronic Spectrum of Propadienylidene (H 2CCC:) and its Relevance to the Diffuse Interstellar Bands

Details Electronic Spectrum of Propadienylidene (H 2CCC:) and its Relevance to the Diffuse Interstellar Bands Electronic Spectrum of Propadienylidene (H 2CCC:) and its Relevance to the Diffuse Interstellar Bands

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...544..838h&link_type=abstract

The Astrophysical Journal, Volume 544, Issue 2, pp. 838-842.

Astronomy and Astrophysics

Astronomy

7

Ism: Molecules, Methods: Laboratory, Molecular Data

Scientific paper

The electronic spectrum of singlet propadienylidene (H2CCC:) matrix isolated in neon at 6 K was measured. Propadienylidene is the only member of the homologous series of neutral carbon chain molecules H2C(C)n to be observed by electronic spectroscopy. The spectrum displays three electronic transitions: two in the visible (A 1A2<--X 1A1 and B 1B1<--X 1A1) and one in the UV (C 1A1<--X 1A1). The longest wavelength transition (A 1A2<--X 1A1) is symmetry forbidden but is weakly seen in the spectrum via vibronic coupling with the B 1B1 state. The other two transitions exhibit well-resolved vibrational progressions. The high density of absorptions in the visible region confirms earlier suggestions that the H2C(C)n family of cumulene carbenes merits careful consideration as potential carriers of diffuse interstellar bands.

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