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Experimental evidence for impulsive energy transfer in electronically adiabatic low-energy collison of Na+with CF4

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
95
Issue
6
Identifiers
DOI: 10.1016/0009-2614(83)80344-3

Abstract

Abstract Time-of-flight measurement of the inelastic scattering of Na + ions from CF 4 reveal two energy-loss mechanisms which have been observed at center-of-mass collison energies between 4 and 24 eV. At small angles θ 1ab≲20° a single energy transfer peak is observed and attributed to normal mode excitation. At larger angles an additional sharp peak is observed out to θ lab = 70° with nearly double the energy transfer. the final velocities and angular dependence agree with an impulsive interaction involving only one of the F atoms with an effective mass which approaches that of the F atoms with increasing collison energy. This is the first evidence for an impulsive mechanism in inelastic collisons at energies below the threshold for electonic excitation.

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