The Abundance of C_7^- in Diffuse Clouds

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Title: The Abundance of C_7^- in Diffuse Clouds
Creators: Ruffle, Deborah P.; Bettens, R. P. A.; Terzieva, Radoslava; Herbst, Eric
Keywords: ISM: abundances
ISM: clouds
ISM: molecules
line: identification
molecular processes
Issue Date: 1999-10-01
Publisher: American Astronomical Society
Citation: Deborah P. Ruffle et al, "The Abundance of C_7^- in Diffuse Clouds," The Astrophysical Journal 523, no. 2 (1999), doi:10.1086/307775
DOI: 10.1086/307775
Abstract: 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^-) ~ 1 × 10^-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.
ISSN: 1538-4357
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