By L. G. Christophorou
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Extra resources for Electron–Molecule Interactions and their Applications
G. Csanak, D. C. Cartwright, S. K. Srivastava, and S. Trajmar 42 In an actual case the axes of the molecules may be taken as in random directions, the hydrogen molecule having no permanent dipole moment and so being only slightly oriented by the electric field of the incident beam. This permits us to average the scattering over all orientation to obtain experimental conditions. Thus Massey assumed that the molecular axes remained fixed during the electron collision process and then averaged the cross section over random orientations of these axes, with the internuclear distance fixed.
Figure 13 displays the incident-electron energy dependence of the measured integral vibrationally elastic scattering cross section for a variety of molecules ranging from H 2 to SF 6 . The purpose of this figure is to illustrate the substantial variation in both the magnitude and electron energy dependence of the integral vibrationally elastic scattering cross sections. Note that the integral cross sections shown in Fig. 13 are always equal to or less than the total scattering cross section for the same molecule because the latter contains contributions from inelastic scattering.
Local exchange) potential. SP Solution obtained using a potential with static and polarization (SP) terms. SMEP Solution obtained using a potential with static plus model exchange and polarization (SMEP) terms. SE Solution obtained using the exact static exchange (SE) potential (containing a nonlocal exchange potential). SEP Solution obtained using the (exact) static exchange plus (model) polarization (SEP) potential. ) Term SOE SOEP DCS E , σΕ DCS R , σκ Description Solution obtained using a model where the static potential is used and an orthogonality condition between the scattering orbital and the occupied orbitals is used to simulate the effect of exchange (SOE).