A laboratory study of the reversible reaction H3/+/ HD yields H2D/+/ + H2 - The electron densities and the temperatures in interstellar clouds

Details A laboratory study of the reversible reaction H3/+/ HD yields H2D/+/ + H2 - The electron densities and the temperatures in interstellar clouds A laboratory study of the reversible reaction H3/+/ HD yields H2D/+/ + H2 - The electron densities and the temperatures in interstellar clouds

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..373a&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 373-379. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

47

Electron Density (Concentration), Hydrogen Clouds, Interstellar Matter, Reaction Kinetics, Temperature Effects, Deuterium Compounds, Hydrogen Ions, Interstellar Chemistry, Nonequilibrium Thermodynamics

Scientific paper

The rate coefficients k1 and k-1 have been determined at 80, 200, and 295 K for the astrophysically important reaction:
k1 H+3 + HD → H2D+ + H2 ← k-1
k1 is greater than k-1 over the temperature range studied, becoming increasingly so with reducing temperature as expected. The enthalpy change, ΔH, and the entropy change, ΔS, in the reaction were obtained from the temperature variation of the equilibrium constant k1/k-1. Using these thermodynamic quantities, k1 and k-1 can be obtained at the temperatures of interstellar clouds. The data have been used in an ion-chemical model, first proposed by Watson, to reestimate the upper limits to the relative electron density, ne/[H2], and the temperature, T, in interstellar clouds. Thus, ne/[H2] is increased by a factor of ∼6, and T is reduced by a factor of ∼2 compared to the previous estimates.

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