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- W2065239077 abstract "view Abstract Citations (3) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interstellar Deuterium in Cold Dense Clouds Opendak, Michael Abstract The mechanism for deuterium fractionation in interstellar clouds is considered within the boundaries of the theory of Dalgarno and Lepp (1984). The abundance of D atoms and fractional ionization in cold clouds are derived from the observational data of molecular ions. It is shown that the abundance of atomic deuterium inside cold dense clouds should always be less than half the abundance of HD. In the five clouds considered, the upper limits of fractional abundance of D lie between 3.0 x 10 exp -7 and 1.9 x 10 exp -6. The upper limits of fractional ionization in cold clouds are found to be at least 3 times lower than previous estimates, and in the given clouds they range from 1.4 x 10 exp -7 to 4.3 x 10 exp -7. These upper limits of fractional ionization are independent of the assumed value of the cosmic deuterium-hydrogen abundance ratio (D)/(H). Publication: The Astrophysical Journal Pub Date: April 1993 DOI: 10.1086/172466 Bibcode: 1993ApJ...406..548O Keywords: Abundance; Deuterium; Hydrogen Atoms; Interstellar Chemistry; Interstellar Gas; Molecular Clouds; Chemical Fractionation; Gas Ionization; Molecular Ions; Astrophysics; ISM: ABUNDANCES; ISM: CLOUDS; MOLECULAR PROCESSES full text sources ADS | data products SIMBAD (6)" @default.
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- W2065239077 date "1993-04-01" @default.
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- W2065239077 title "Interstellar deuterium in cold dense clouds" @default.
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