Abstract
ESD of negative ions has been examined from the CO/Rh(111) system. The desorption yield of O − exhibits a behavior which is distinctly different from that observed for O + and CO +. Delayed onset of O − is observed in the early stages of uptake. Near saturation little decrease is observed, indicating that the resonance charge exchange process is not very effective in negative ion neutralization. The desorption energy of O + was observed to reflect the CO adsorbate structural change which occurs near 1 L CO exposure on the Rh(111) surface. An abrupt shift to higher desorption energy was observed at the exposure necessary to produce filling of bridge-bonded sites.
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