The determination of electron abundances in interstellar clouds

Details The determination of electron abundances in interstellar clouds The determination of electron abundances in interstellar clouds

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..876w&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 876-880.

Astronomy and Astrophysics

Astrophysics

50

Abundance, Electron Density (Concentration), Interstellar Matter, Molecular Excitation, Carbon Monoxide, Cosmic Rays, Interstellar Chemistry, Ion Production Rates, Reaction Kinetics

Scientific paper

An independent method is proposed for the determination of electron abundances in dense clouds based upon the abundance ratio of HCO(+) and CO. The method is derived from a simple application of gas phase ion molecule interstellar chemistry. It is noted that unlike the fractionation of deuterated molecules, it applies to warm as well as to cool clouds. The method is illustrated with the results of the recent abundance survey of Wooten et al. (1978). Finally, it is shown that in cases where deuterium enhancement is measured, an upper limit can be obtained for the cosmic ray ionization rate.

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