The Detection and Distribution of Molecular Anions in Space

Details The Detection and Distribution of Molecular Anions in Space The Detection and Distribution of Molecular Anions in Space

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21422102m&link_type=abstract

American Astronomical Society, AAS Meeting #214, #221.02; Bulletin of the American Astronomical Society, Vol. 41, p.727

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Scientific paper

In the span of less than three years, the number of molecular anions in space has grown from zero to five, with the radio detections of C6H_, C4H_, C8H_, and C3N_ in rapid succession in rich astronomical sources, including the circumstellar shell of the evolved carbon star IRC+10216, the cold dark cloud TMC-1, and the low-mass star forming region L1527. Although not yet detected in the laboratory, there is also very strong evidence for C5N_ in IRC+10216. Most of the new anions are present at the level of at least of few percent with respect to their neutral counterparts.
To better determine the distribution of anions in space, and to better establish their abundance relative to that of their neutral counterparts, a survey of C6H_ in 24 Galactic sources was recently undertaken with the 100 m Green Bank Telescope (GBT). Two new sources of C6H_ were discovered; with somewhat deeper searches C6H_ may be found in many sources _ dark clouds especially, but in other sources as well. At present, C6H_ provides the best available probe of negative charge; its abundance in molecular clouds provides an independent and complementary means of estimating the fractional ionization there.
This talk will provide a broad overview of our recent laboratory and astronomical work on anions.
The author acknowledges support by the NSF Center for `Chemistry of the Universe', grant CHE-0847919, NSF grant CHE-0701204, and NASA grant NNX08AE05G.

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