By Ian E. McCarthy, Erich Weigold
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Additional resources for Electron-Atom Collisions (Cambridge Monographs on Atomic, Molecular and Chemical Physics)
This can reveal structure, such as resonances and cusps, in the cross section of the chosen process. Energy-loss spectra can also be obtained by fixing the energy £,- of the emitted electrons and varying the incident energy and energy loss simultaneously. This gives information on each energy-loss feature at the same impact energy above its own threshold. Finally, of course, in the measurement of the differential cross section EQ, Ei and E are all kept fixed and the scattering geometry (6) is varied.
The position of arrival of electrons traversing the analysers is determined by charge division between the four Position signal Time signal Toroidal Analyser Position signal Amplitude J Computer Hemispherical Analyser t Lens Power supply Fig. 9. Schematic view of the coincidence spectrometer of Storer et al (1994) showing the hemispherical and toroidal energy and azimuthal angle analysers. 28 2 Experimental techniques for cross-section measurements corners of a two-dimensional resistive anode. All the data acquisition is via an online computer, which determines the angle of emission and energy of each detected electron, and corrects the coincidence timing information for the flight time of the electrons through the two analysers.
Lens. This means that by a suitable choice of parameters the atom density can be optimised at the interaction region. A small solenoid placed axially at the exit of the hexapoles is used to align the spins with the axis of motion of the atoms, so that the atomic spins are perpendicular to the intersecting electron beam. A magnetic spin rotator (Iannotta, 1988) at the exit to the interaction region adiabatically rotates the atomic spins into the transverse orientation, in preparation for polarisation analysis by a Stern—Gerlach dipole magnet (Ramsay, 1956).
Electron-Atom Collisions (Cambridge Monographs on Atomic, Molecular and Chemical Physics) by Ian E. McCarthy, Erich Weigold