Interstellar catalysis. II - Comparison of the theory of H2 formation with observations

Details Interstellar catalysis. II - Comparison of the theory of H2 formation with observations Interstellar catalysis. II - Comparison of the theory of H2 formation with observations

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..54..211t&link_type=abstract

Astrophysics and Space Science, vol. 54, no. 1, Mar. 1978, p. 211-232.

Astronomy and Astrophysics

Astrophysics

4

Catalysts, Hydrogen Clouds, Interstellar Chemistry, Interstellar Gas, Cosmic Rays, Diatomic Gases, Interstellar Matter, Reaction Kinetics, Steady State

Scientific paper

Steady-state equilibrium abundances of H, H2, electrons, H(+), H(-), H2(+), and H3(+) are computed for large tenuous interstellar hydrogen dust clouds. The calculations take into account the catalytic production of H2 on transition metal grains, as well as eighteen gas-phase reactions. Metal grains are found to provide an interstellar hydrogen production mechanism as efficient as any physical adsorption mechanism, if conditions of extinction in the visible are optimum. The effectiveness of the catalytic reactions is discussed in terms of activation energy of desorption, grain temperature and the number density of available reaction sites.

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