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Comparative Chemistry of Diffuse Clouds II: CN, HCN, HNC, CH3CN & N2H+
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Comparative Chemistry of Diffuse Clouds II: CN, HCN, HNC, CH3CN & N2H+
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Using the Plateau de Bure interferometer, we observed the 3mm absorption lines of CN, HCN and HNC from some of the diffuse clouds which lie toward our well-studied sample of compact extragalactic mm-wave continuum sources. The column densities of these species all vary by a factor of about fifty and are prominent in only a limited subset of the clouds seen in the most ubiquitous species such as OH, HCO+, C2H and C3H2. The CN, HCN, and HNC column densities vary in fixed proportion to each other, with <N(HNC)/N(HCN)> = 0.21+/-0.05 and <N(CN)/N(HCN)> = 6.8+/-1. We searched unsuccessfully for CH3CN and N2H+, which are underabundant compared to dark clouds, by factors of at least 10 and 100, respectively.
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