Abstract
Collisional ionization of Cs and K atoms by O2 has been studied in a crossed beam geometry from threshold to ∼100 eV alkali laboratory system energy. The energy spectra of forward directed positive (Cs+ and K+) and negative (O− and O−2) ions were measured by electrostatic energy analysis. The dominant O−2 negative ion is associated with forward scattering of the alkali positive ion in the center-of-mass system but O− production appears associated with backward scattering of the alkali ion.
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