Solid-State CO Oxidation by Atomic O: A Route to Solid CO2 Synthesis in Dense Molecular Clouds

Details Solid-State CO Oxidation by Atomic O: A Route to Solid CO2 Synthesis in Dense Molecular Clouds Solid-State CO Oxidation by Atomic O: A Route to Solid CO2 Synthesis in Dense Molecular Clouds

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...737l..14r&link_type=abstract

The Astrophysical Journal Letters, Volume 737, Issue 1, article id. L14 (2011).

Astronomy and Astrophysics

Astronomy

Astrochemistry, Infrared: Ism, Ism: Abundances, Ism: Molecules, Methods: Laboratory, Molecular Processes

Scientific paper

Investigations with infrared spectroscopy and microgravimetry show that CO2 forms in small quantities during codeposition of CO and cooled O and O2 into thin films at 20 K: ~3 × 1014 CO2 cm-2 within a film containing 2.7 × 1017 CO cm-2. The reason for the low CO2 yield is that O atoms react preferentially with O to form O2, and with O2 to form ozone, which was not considered in previous studies with atomic beams. Heating a CO + O + O2 film capped with a ~2.5 μm thick water ice layer to 80 K increased CO2 by 30%, showing additional reactions between O and CO diffusing in the ice layer. Although the CO2:CO = 10-3 measured in our experiments is at least two orders of magnitude smaller than reported interstellar ratios, sputtering and differential desorption during transient heating events, e.g., by impacts of cosmic rays or stellar winds, can increase the ratio to observed values.

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