Biology
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.518...37b&link_type=abstract
In: Proceedings of the First European Workshop on Exo-Astrobiology, 16 - 19 September 2002, Graz, Austria. Ed.: Huguette Lacoste
Biology
1
Interstellar Matter: Astrochemistry, Organic Molecules
Scientific paper
Our approach to the assignment of Polycyclic Aromatic Hydrocarbons (PAHs) cations as carriers of some of the Diffuse Interstellar Bands (DIBs) includes two complementary studies: the recording of the electronic spectra of cold PAH cations in the gas phase, and a systematic search for possible correspondence in astronomical DIBs spectra. The PAH cation visible spectra were recorded via monitoring the fragmentation ratio of the PAH+-argon van der Waals complex in a molecular beam as a function of the photon energy of a visible laser beam crossing the molecular beam. Two obervation campaigns with the TBL were carried out and allowed us to search for correspondence between the bands observed in the laboratory spectra and in astronomical spectra, thanks to specific observational protocol and data processing. Upper-limits of abundance were determined for five PAH cations. Interstellar absorption zones identified in our spectra are of variable width and some of them are very likely the result of a combination due to several species.
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