Abstract
The interaction of low energy electrons and UV photons with CF 3Cl adsorbed on Pt(111) has been studied using temperature-programmed desorption (TPD), photoelectron spectroscopy (XPS, UPS) and work-function (Δφ) measurements. The adsorption of CF 3Cl on Pt(111) at 50 K is completely reversible. There are two distinct desorption peaks — 111–116 K (monolayer) and 82 K (multilayer). Unlike CH 3Cl, no photoeffects are observed when adsorbed CF 3 Cl is exposed to UV photons generated from a Hg arc lamp. Exposure to low energy ( ~ 47 eV) electrons dissociates the adsorbed molecule. The evolution of CF 3, but no CF 3Cl or Cl, occurs during irradiation. The electron-induced dissociation (EID) cross section increases with electron energy and has a threshold energy of about 12 eV. The cross section is about 7 × 10 −16 cm 2 at 47 eV.
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