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Chemical effects of 100 keV primary electrons in an e-beam sustained carbon dioxide laser discharge

The dissociation of carbon dioxide and the reaction of carbon monoxide with oxygen caused by a high-energy (approx. 100 keV) electron beam in a typical carbon dioxide laser gas mixture has been observed. The variation of reaction rates with electron energy and current, interelectrode spacing, and gas composition has been studied. The rates of both processes suggest that the reactions are caused by unthermalized secondary electrons. The conditions were investigated under which the carbon monoxide oxidation reaction could be used to offset dissociation in a laser and thus prolong its sealed life. For a secondary to primary current ratio of one hundred this condition should be satisfied for any practical device. A sealed run was carried out which demonstrated that dissociation by secondary electrons could be offset by the oxidation of carbon monoxide by the primary electrons.