A particularly useful constraint for models of CH+ formation in interstellar clouds is knowledge of the amount of CH associated with CH+ synthesis. For lines of sight with no detectable CN absorption, this column of CH can be inferred through a combined analysis of C I excitation and simplified chemical models. The approach is applied to data for two lines of sight, those toward 23 Ori and β1 Sco, for which N(CH)/N(CH+) ≤ 0.40.
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Federman et al. (1997) studied this question.
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