Oxygen Chemistry in the Interstellar Medium: The Effect of Vibrational Excitation of H2 in the O(3P)+H2 Reaction

Details Oxygen Chemistry in the Interstellar Medium: The Effect of Vibrational Excitation of H2 in the O(3P)+H2 Reaction Oxygen Chemistry in the Interstellar Medium: The Effect of Vibrational Excitation of H2 in the O(3P)+H2 Reaction

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...629..305s&link_type=abstract

The Astrophysical Journal, Volume 629, Issue 1, pp. 305-310.

Astronomy and Astrophysics

Astronomy

9

Astrochemistry, Ism: Molecules, Molecular Data, Molecular Processes

Scientific paper

The O+H2-->OH+H reaction is considered to be the key step in initiating oxygen chemistry in shocked interstellar molecular clouds. We present extensive quantum scattering calculations of rate coefficients of the O+H2-->OH+H reaction involving both ortho and para hydrogen in the temperature range 100-4000 K. The role of vibrational excitation of H2 is examined, and it is shown that vibrational excitation of the molecule has a significant effect on reactivity, especially at low temperatures. At 100 K, the rate coefficient increases by about 11 orders of magnitude when the H2 vibrational quantum number is increased from v=0 to v=3. Initial vibrational state selected cross sections, rate coefficients, and product OH vibrational level distributions are presented for v=0-3 of the H2 molecule.

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