Laboratory simulation of tunneling reactions in interstellar ices

Details Laboratory simulation of tunneling reactions in interstellar ices Laboratory simulation of tunneling reactions in interstellar ices

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rapc...60..389h&link_type=abstract

Radiation Physics and Chemistry, Volume 60, Issue 4-5, p. 389-393.

Physics

5

Scientific paper

The reactions of the solid thin films of C2H2, C2H4 and CO deposited on the silicon substrate at 10K with cold H atoms (~27K) sprayed over the solid films were studied by thermal desorption mass spectrometry and Fourier transforn (FT)-IR spectroscopy. In the reaction of H with C2H2, C2H6 was found to be the major product but C2H4 could not be detected. This finding is in accord with the observation of comets Hyakutake and Hale-Bopp, i.e., C2H2 and C2H6 but no C2H4 were detected in the comae of these comets. In the reaction of H with CO, HCHO was found to be the major product but no CH3OH was detected. In all the reactions investigated, the product yields increased drastically with decrease of temperature from ~50 to 10K. This may be mainly due to the increase of the sticking probability of H atoms on the solid films. The increase of the rate constant for the tunneling reaction H+C2H2 with decrease of temperature has been suggested.

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