Absolute Cross-Sections for Dissociative Electron Attachment in O2 Condensed on Kr Films.

摘要

The absolute dissociative - electron - attachment cross section for O2 condensed on a Kr film is found to be about 20 times larger than that for gaseous O2. This large enhancement is attributed to a downward energy shift (about 0.9 eV) of the O2-(2 Pi sub u) intermediate state due to electronic polarization of the neighboring Kr atoms. Based on the theory developed by O'Malley Phys. Rev. 150, 14 (1966) and 155, 59 (1967), we have shown that this downward shift increases the dissociative attachment by a factor of 21, through a reduction in the autoionization of the intermediate state. Keywords: Negative ion desorption; Rare gases; Dissociative attachment. (jhd)