Crossed-beam experiment for the scattering of low energy electrons from CF4
- 14 April 1992
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 25 (7) , 1607-1620
- https://doi.org/10.1088/0953-4075/25/7/029
Abstract
Differential scattering cross sections (DCS) for electron-CF4 collisions in the energy range from 1.5 to 100 eV were measured with a crossed beam instrument for scattering angles of 15' to 130'. The DCS are normalized by reference to He. Integral and momentum transfer cross sections are compared with measurements of total cross sections, swarm experiments and theory. The integrated DCS show a broad structure at 7 eV of symmetry T2 as predicted by theory, and one broad peak from 15 to 25 eV. The observed peaks differ in magnitude and angular distribution from recent SMC calculations. Evidence of a shape resonance of T2 symmetry was observed in the recorded angular distributions for vibrational modes nu 0, nu 1, nu 3, and nu 4. In addition a large cross section for nu 3 excitation with 2 eV electrons was found to occur by a direct mechanism.Keywords
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