By D.R. Bates (ed.), Benjamin Bederson (ed.)
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Additional resources for Advances in Atomic and Molecular Physics, Vol. 14
All scattering events at the angle 6 shown on the figure in the volume labeled 0 will exit from the interaction region and therefore will not be detected as scattering events. All scattering events at the angle 8 in the volume labeled 1 on the figure will be detected. Approximately half of the scattering events at the angle 8 in the volumes labeled 1/2 on the figure will be detected. If a scattering event is equally likely to occur any place within the volume nS2L/4, the fraction of scattering events detected is simply given from the various volumes multiplied by the appropriate fractional area divided by the total volume : 1-- S 2L tan 8’ S tan8 3 2L S tan8 < 2L ELECTRON ATOM AND MOLECULE SCATTERING 21 L FIG.
The measurement of McGowan et a/. 02eV. The negative-ionneutral-collision measurements of Riseley et al. 04eV. Both of these experiments attribute the structure to the (3p2)'D state of H-. More recently the transmission experiment of Spence (1975a), which is relatively free of H, contamination of the H beam, has shown that only the one resonance is strongly coupled to the ground state of atomic hydrogen. 03 eV. The experimental results for the 2s excitation cross section are shown in Fig. 18 together with the results of a recent variational calculation using a basis set of six atomic eigenstates and eight pseudostates by L.
The electrons are momentum selected by a combination of the three slits S1, S z , and S, and a uniform magnetic field perpendicular to the plane of the diagram. 5. Schematic arrangement of the modified Ramsauer transmission apparatus of Golden and Bandel (1965a). The Ramsauer experiment is an example of a transmission experiment. The schematic arrangement shown in Fig. 6 is for the generalized transmission experiment. 6 . Schematic arrangement of the generalized transmission experiment (from Golden, 1973).