The Abundance of C^-_7 in Diffuse Clouds

Details The Abundance of C^-_7 in Diffuse Clouds The Abundance of C^-_7 in Diffuse Clouds

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523..678r&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 2, pp. 678-682.

Astronomy and Astrophysics

Astronomy

15

Ism: Abundances, Ism: Clouds, Ism: Molecules, Line: Identification, Molecular Processes

Scientific paper

It has recently been proposed that C^-_7 is a carrier of five of the numerous diffuse interstellar bands. In this paper, we report an attempt to reproduce the required abundance of C^-_7 relative to hydrogen of n(C^-_7)~1x10^-9n_H through the use of various models for the chemistry in diffuse clouds. Our model network contains large neutral and charged linear hydrocarbons and incorporates the time-dependent desorption of seed molecules from grain surfaces. We find a limited set of physical and chemical conditions that result in the required fractional abundance of C^-_7 but only for rather short periods of time.

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