Can negative molecular ions be detected in dense interstellar clouds

Details Can negative molecular ions be detected in dense interstellar clouds Can negative molecular ions be detected in dense interstellar clouds

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.289..656h&link_type=abstract

Nature, vol. 289, Feb. 19, 1981, p. 656, 657.

Physics

55

Interstellar Chemistry, Molecular Clouds, Molecular Ions, Abundance, Chemical Reactions, Electron Attachment, Interstellar Gas

Scientific paper

The possibility of the presence and the potential detectability of negative molecular ions in dense interstellar clouds are investigated. In light of the recent measurement of rapid room temperature radiative electron attachment coefficients at low pressures, a theory for the radiative attachment coefficients of interstellar neutral species capable of forming negative ions is derived from phase space considerations. It is argued that for certain interstellar species, the abundance ratio of the negative ion to the neutral molecule may be as high as 0.01-0.1 in commonly assumed physical conditions. It is pointed out, however, that such negative molecular ions would be detectable only if the original free radical has an abundance of 0.01 with respect to the stable molecule, which seems unlikely.

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