Assignment of 5069 Å Diffuse Interstellar Band to HC4H+: Disagreement with Laboratory Absorption Band

Details Assignment of 5069 Å Diffuse Interstellar Band to HC4H+: Disagreement with Laboratory Absorption Band Assignment of 5069 Å Diffuse Interstellar Band to HC4H+: Disagreement with Laboratory Absorption Band

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...729l..20m&link_type=abstract

The Astrophysical Journal Letters, Volume 729, Issue 2, article id. L20 (2011).

Astronomy and Astrophysics

Astronomy

1

Ism: General, Ism: Lines And Bands, Ism: Molecules, Methods: Laboratory, Techniques: Spectroscopic

Scientific paper

Krełowski et al. have reported a weak, diffuse interstellar band (DIB) at 5069 Å which appears to match in both mid-wavelength and width the A 2Πu-X 2Πg gas-phase origin absorption band of HC4H+. Here, we present laboratory rotational profiles at low temperatures which are then compared with the 5069 Å DIB using ~0.1 and 0.3 Å line widths based on a realistic line-of-sight interstellar velocity dispersion. Neither the band shape nor the wavelength of the maximum absorption match, which makes the association of the 5069 Å DIB with HC4H+ unlikely. The magnetic dipole transition X 2Πg Ω = 1/2→X 2Πg Ω = 3/2 within the ground electronic state which competes with collisional excitation is also considered. In addition, we present the laboratory gas-phase spectrum of the A 2Πu-X 2Πg transition of HC4H+ measured at 25 K in an ion trap and identify further absorption bands at shorter wavelengths for comparison with future DIB data.

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