By Ian E. McCarthy, Erich Weigold
Read or Download Electron-Atom Collisions (Cambridge Monographs on Atomic, Molecular and Chemical Physics) PDF
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Extra resources for Electron-Atom Collisions (Cambridge Monographs on Atomic, Molecular and Chemical Physics)
In general, however, some simplifying assumptions can be made. 17) includes all the instrumental and geometrical factors. e. and Z(Ei9T) = Z(Ei). 21) = f f f(Eo)i(Ei)dEidEo. 22) / / Jrr JQ( JQ(r) and C(Et) JEi JE0 Feff (0,4>) can be calculated from a knowledge of the density distributions of the intersecting beams and the acceptance angles of the detector. Its angular dependence has been calculated for a number of frequently used scattering geometries and beam sources by Brinkmann and Trajmar (1981).
4 Triple-differential or (ef2e) cross sections The so-called triple-differential cross section is the measure of the probability that in an (e,2e) event an incident electron of momentum ko and energy £o produces two electrons of energy and momenta Eu E^ and k,-, k^ in the solid angles dQi(6i,(/)i) and dQ^O^cf)^) respectively. It is the most kinematically-complete description of ionisation and provides the most sensitive test of the theory of this process if no polarisations and no angular momentum projections are observed.
1990), permitting the investigation of (e,2e) collisions with oriented and excited atoms. The laser, atomic and electron beams all intersect at right angles. , 1992). This is achieved by a design in which the 26 2 Experimental techniques for cross-section measurements Fig. 8. Schematic diagram of an (e,2e) coincidence spectrometer (Weigold et al, 1991). two electrostatic analysers rotate independently about a common vertical axis while the electron gun rotates about a horizontal axis that lies in the plane of rotation of the analysers.