Other
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979znata..34..163r&link_type=abstract
Zeitschrift für Naturforschung, Teil a, vol. 34a, Feb. 1979, p. 163-166.
Other
2
Interstellar Gas, Ortho Hydrogen, Para Hydrogen, Forbidden Transitions, Hydrogen Clouds, Thermodynamic Equilibrium
Scientific paper
The ortho/para molecular hydrogen ratio in the interstellar medium is considered. It is shown that the ortho/para ratio will be 3:1 in practically all chemical reactions, even at relatively low temperatures. Two examples of exothermic processes that will result in the formation of a 3:1 ortho:para ratio, corresponding to a high-temperature equilibrium, are examined: H2 formation via three-body or surface recombination and catalytic recombination involving electrons and H(-) ions. Gas-phase scrambling ion reactions are also discussed, and it is suggested that virtually all the H2 equilibrated via scrambling reactions involving H(+) and H3(+) ions should exist as parahydrogen in the J 0 quantum state. Arguments are given that deuterium cannot interfere with the long scrambling chain that results in parahydrogen formation.
Harteck P.
Reeves Robert
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