Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1603o&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #16.03; Bulletin of the American Astronomical Society, Vol. 24, p.1146
Astronomy and Astrophysics
Astronomy
Scientific paper
The theory of the deuterium fractionation of Dalgarno and Lepp (1984) is extended to include rapid dissociative recombinations of {H_3}(+) and H_2D(+) with electrons. Observational data of molecular ions can be used in conjunction with the theory to derive fractional ionization and abundance of D atoms in cold clouds. In a sample of five clouds upper limits of fractional ionization from 1.8 times 10(-8) to 4.0 times 10(-7) were obtained. Estimates of abundance of atomic deuterium depend on accepted rate coefficient, alpha , for the dissociative recombination {H_3}(+) and H_2D(+) . Assuming alpha < 1.7 times 10(-7) (for T = 273K) we find in the same sample, that the upper limits of fractional abundance of D atoms lie between 3.4 times 10(-7) and 2.0 times 10(-5) .
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