By D.R. Bates (ed.), Benjamin Bederson (ed.)
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Extra resources for Advances in Atomic and Molecular Physics, Vol. 14
A different range of scattering angles will be detected at different positions in the interaction region. The geometry of the interaction region, the presence or absence of an external magnetic field, and the potentials on the interaction region can effect this range. In addition, the angular form of the differential scattering cross section and therefore the electron energy considered will also have an effect. In order to obtain a quantitative estimate of these effects we introduce a function F(8, E ) , which will represent the fraction of scattering events in the interaction region that contribute to the attenuation of the transmitted current.
The existence of this resonance was confirmed by the experiments of Fleming and Higginson (1963), Simpson and Fano (1963), Golden and Bandel (1965a), Kuyatt et al. (1965), Ehrhardt and Meister (1965), and Andrick and Ehrhardt (1966). 20. The first observation of the ( 1 ~ , 2 s ~ resonance )~S in e--He scattering by elastic scattering at 72- (from Schulz, 1963). D. E. Golden 42 width as about 10meV. The scattered electron angular distribution measurements of Ehrhardt and Meister (1965) and Andrick and Ehrhardt (1966) in the vicinity of the resonance have confirmed the conclusion of Simpson and Fano (1963), which led to its classification as a 'S state.
The excitation functions of seven S states for 3 d n < 6 from Heddle (1977) are shown in Fig. 23. 47 ELECTRON ATOM AND MOLECULE SCATTERING I I - -- . ' . . : 'D 1; 'I ..... '.. .. . .. ... . ................................................ . . . . . . ..... .... . . -. : , . ........... : . . . . . . . . .......... . : . I -I- I ....... .... : , ' . ... . ... . . .. .. '+i. 6 I . .. 0 .... 23. Excitation functions of the 33S, 3'S, 43S, 4'S, 5 j S , 5 ' S , and 6's states of He in order of threshold energy (from Heddle, 1977).
Advances in Atomic and Molecular Physics, Vol. 14 by D.R. Bates (ed.), Benjamin Bederson (ed.)