Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..636p&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 15, 1982, p. 636-640.
Astronomy and Astrophysics
Astrophysics
34
Carbon Dioxide, Formaldehyde, Ice, Interstellar Chemistry, Ion Irradiation, Helium Ions, Molecular Collisions, Partial Pressure
Scientific paper
The measurement of formaldehyde production in an ice mixture of equal parts of water and carbon dioxide under irradiation by fast helium ions at temperatures of 9 K and above is reported. Using isotopically labeled gases, the formaldehyde was observed to form about 3 times more efficiently by transfer of a carbon from CO2 to the water than by transferring H2 from the water to a CO fragment from the CO2. The production rate of H2CO was found to be about 3.7 per incident ion for the ice layers used in the reported experiment. No significant production of formic acid was found. Such experiments and results as these are important for several problems in astrophysics, including the quantitative assessment of the influences of cosmic rays in interstellar space as agents for the production of molecular species in the mantles of grains.
Brown Warren L.
Lanzerotti Louis J.
Marcantonio K. J.
Pirronello Valerio
Simmons Elizabeth H.
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