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It has recently been proposed that C 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 relative to hydrogen of n (C ) ~ 1 × 10 -9 n 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 but only for rather short periods of time.
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Ruffle et al. (1999) studied this question.
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