Abstract
A crossed-beam electron spectrometer using hemispherical electrostatic velocity analysers is described. Electron energy-loss spectra for K have been obtained at 41, 51, 68, 101 and 201 eV incident electron kinetic energies. The f-sum rule has been used to obtain generalized oscillator strengths and absolute differential cross sections for the transitions 4 2S -> 4 2P, 5 2S, 3 2D, 5 2P, 4 2F, 6 2P. The reduced matrix element (4 2Sparallelr2parallel5 2S) was found to be 54 A.U., and the electric quadrupole transition probability for 3 2D -> 4 2S found to be 5 × 102 s-1. A method is suggested for absolute calibration of atomic beams in crossed-beam experiments.
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