The C4H radical and the diffuse interstellar bands: an AB initio study

Details The C4H radical and the diffuse interstellar bands: an AB initio study The C4H radical and the diffuse interstellar bands: an AB initio study

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432l..63k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 1, p. L63-L66

Astronomy and Astrophysics

Astrophysics

15

Carbon Compounds, Energy Bands, Excitation, Hydrogen Compounds, Interstellar Matter, Radicals, Molecular Clouds, Ultraviolet Radiation

Scientific paper

The electronic transitions of the C4H radical are investigated using correlated ab initio methods. The 0-0 bands are predicted to occur at 2484, 3884, and 3869 A for the tilde-C2sigma(+) - tilde-X2sigma(+), tilde-B2pi - tilde-X2sigma(+) and tilde-B2pi - tilde-A2pi transitions, respectively. These results suggest that the strong 4428 A diffuse interstellar band is not carried by C4H. The wavelengths of the strong, parallel (2pi - 2pi) transitions from the ground states of C6H, C8H, C10H, and C12H are predicted to be 4798, 5834, 6906, and 7993 A, using a simple semiempirical model. Comparison of these data with observed wavelengths adds support to the thesis that long carbon chains are carriers of diffuse interstellar bands.

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