Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.150d&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Recently a weak, diffuse interstellar band (DIB) at 5069 Å/ was claimed to coincide in wavelength and width with the A ^2Πu - X ^2Πg gas-phase origin absorption band of HC_4H^+. Laboratory rotational profiles recorded at low temperatures are presented and a comparison with astronomical data is done based on realistic velocity dispersion at typical interstellar temperatures. As a result neither the wavelength of the maximum absorption nor the band shape match which makes the identification of the 5069 Å/ DIB with HC_4H^+ unlikely. Furthermore, the laboratory gas-phase spectrum of the A ^2Πu - X ^2Πg transition of HC_4H^+ measured at 25 K in an ion trap is presented to identify additional absorption bands at shorter wavelengths for comparison with future DIB data.
Chakrabarty Somenath
Dietsche R.
Maier John P.
Mazzotti F. J.
Rice Christopher A.
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