The synthesis and direct detection of O-atoms in water ice

Details The synthesis and direct detection of O-atoms in water ice The synthesis and direct detection of O-atoms in water ice

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p11d0803c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P11D-0803

Physics

5410 Composition (1060, 3672), 5422 Ices, 6221 Europa, 6222 Ganymede

Scientific paper

The detection of molecular oxygen on the surfaces, and O-atoms in the tenuous atmospheres of icy outer solar system bodies has resulted in a number of laboratory studies that have investigated how molecular oxygen is formed in radiolyzed ices. Due to the weak band strengths of oxygen's vibronic and electronic transitions, detection of O2 is often performed by a mass spectrometer as the O2 is sputtered, desorbed or sublimed out of the ice. We present a new in situ method for inferring O2 formation via a method in which isotopologues of ozone are detected in experiments where water ice is doped with small quantities of 18O2. The detection of ozone isotopologues containing 16O shows that 16O atoms are produced directly from the radiolysis of water. Based upon our laboratory data, we provide a lower estimate for O2 formation in radiolyzed ices that is in agreement with the estimated O2 abundance on Ganymede.

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