Ortho to para conversion of H2 on interstellar grains

Details Ortho to para conversion of H2 on interstellar grains Ortho to para conversion of H2 on interstellar grains

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...360..656l&link_type=abstract

Astronomy and Astrophysics, Vol. 360, p.656-662

Astronomy and Astrophysics

Astrophysics

29

Molecular Processes, Ism: Molecules, Ism: Abundances, Ism: Dust, Extinction

Scientific paper

Fast conversion of ortho-H2 to para-H2 can occur (and has been observed in the laboratory) on the surface of non magnetic, non metallic grains. In a PDR, the fraction of H2 converted depends on the ratio of the characteristic time of conversion (of the order of 1 minute) to the residence time of physisorbed H2 . This later time is itself an exponentially varying function of the grain temperature and of the adsorption binding energy of H2 . Conversion is very efficient in cool PDRs if the dust temperature is below a critical temperature that we determine, and leads to a much reduced ortho to para ratio of H2 in the gas phase. Emission lines within para levels of H2 are significantly enhanced.

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