Abstract
Significant sharp enhancements (FWHM ≤ 0.5 eV) are observed in electron stimulated desorption O − yields, obtained from small quantities of CO 2 physisorbed on thick rare gas substrate films. The enhancement are positioned 0.3–0.4 eV below the lowest substrate exciton energy, and are attributed to a coupling of the (electron plus exciton) core-excited anion resonances of the rare gas atoms to the dissociative temporary molecular anion states of the co-adsorbed CO 2 at the solid's surface. This causes a transfer of the charge and excitation energy to the co-adsorbate.
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