DISSOCIATIVE SCATTERING OF CF3-COVERED AG(111) SURFACE( FROM A BARIUM)

The dissociative scattering of CF3+ ions from a barium-covered Ag(111) surface has been studied for incident energies between 100 and 500 eV . The negatively charged scattering products only showed F- and the po sitives showed CF+ and C+ fragments, No negatively charged molecular i ons are observed. The results are compared with those on scattering fr om a clean Ag(111) surface. The lowering of the work function facilita tes resonant neutralization into the excited 3s Rydberg state of the n eutral molecule. Consequently, the spectral features associated with A uger neutralization are not observed.