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Volume 109, 1998
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H3+ in dense and diffuse clouds


Interstellar H3+ has been detected in dense as well as diffuse clouds using three 3.7 µm infrared spectral lines of the ν2 fundamental band. Columndensities of H3+ from (1.7–5.5)×1014 cm-2 have been measured in denseclouds in absorption against the infrared continua of the deeply embedded young stellar objects GL2136, W33A, MonR2 IRS 3, GL961E, and GL2591. Strong and broad H3+ absorptions have been detected in dense and diffuse clouds towards GC IRS 3 and GCS3-2 in the region of the galactic center. A large column density of H3+, comparable to that of a dense cloud, has been detected towards the visible star Cygnus OB2 No. 12, which has a line of sight that crosses mostly diffuse clouds. The H3+ chemistry of dense and diffuse clouds are discussed using a very simple model. Some future projects and problems are discussed.

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Article information

Faraday Discuss., 1998,109, 267-280
Article type

H3+ in dense and diffuse clouds

B. J. McCall, K. H. Hinkle, T. R. Geballe and T. Oka, Faraday Discuss., 1998, 109, 267
DOI: 10.1039/A800655E

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