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Formation of CO and CO$_2$ after ion irradiation of water ice covered carbon grains

It has been investigated the possibility that solid carbon dioxide (CO$_2$) and partially carbon monoxide (CO) observed in dense molecular clouds are formed after cosmic ion irradiation of water ice covered carbon grains (). Extrapolation of the experimental results to the conditions of dense interstellar clouds indicates that the amount of CO$_2$ produced by cosmic ion irradiation of carbon particles can account from 3% to 7% of the observed column densities. In the case of CO, the contribution ranges from 3% to 36%.



Innocenza Busa' 2005-11-14