The Reactions of H and D Atoms with Thin Films of Formaldehyde and Methanol at Cryogenic Temperatures

Details The Reactions of H and D Atoms with Thin Films of Formaldehyde and Methanol at Cryogenic Temperatures The Reactions of H and D Atoms with Thin Films of Formaldehyde and Methanol at Cryogenic Temperatures

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...620..542h&link_type=abstract

The Astrophysical Journal, Volume 620, Issue 1, pp. 542-551.

Astronomy and Astrophysics

Astronomy

10

Astrochemistry, Molecular Processes

Scientific paper

The reactions of H and D atoms with solid formaldehyde (H2CO) and methanol (CH3OH) were investigated in the temperature region of 10-30 K. From the reaction of H with solid H2CO at 10 K, CO, CH3OH, and paraformaldehyde (polyoxymethylene) were the major products, with yields of about 1% or less under the experimental conditions. The yields of these products decrease steeply with an increase in temperature, and they become negligible at ~25 K. From the reaction of D with solid H2CO at 10 K, CO, HDCO, CH2DOD, and paraformaldehyde were formed. The branching ratio of the reaction [D+HCO-->CO+HD] to [D+HCO-->HDCO] was measured to be about 1:6. The ratio of the yield of CH3OH from the reaction [H+H2CO] to that of CH2DOD from the reaction [D+H2CO] is ~7:1 i.e., there is a marked isotope effect on the addition reaction of H and D to H2CO. In the reaction of H and D with CH3OH, H2CO was not detected as a reaction product.

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