The temperature dependence of the HCO/+//DCO/+/ abundance ratio in dense interstellar clouds

Details The temperature dependence of the HCO/+//DCO/+/ abundance ratio in dense interstellar clouds The temperature dependence of the HCO/+//DCO/+/ abundance ratio in dense interstellar clouds

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111...76h&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 1, July 1982, p. 76-80.

Astronomy and Astrophysics

Astrophysics

43

Abundance, Deuterium Compounds, Interstellar Chemistry, Molecular Clouds, Temperature Dependence, Thermodynamic Equilibrium, Brightness Temperature, Interstellar Matter, Ionization, Nonequilibrium Thermodynamics, Reaction Kinetics

Scientific paper

The equilibrium coefficient of the reaction system H+3 (HD) = H2D + (H2) has been calculated and found to disagree somewhat with earlier calculated and extrapolated values at interstellar cloud temperatures. Non-equilibrium effects under interstellar conditions that might affect the forward and reverse reaction rates have also been investigated and found to be of minor significance. Our results permit determination of dense cloud temperatures (or an upper limit to the temperatures) from observed [HCO+]/[DCO+] abundance ratios. The derived temperatures for selected "warm" interstellar clouds are compared with CO brightness temperatures.

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