Abstract
Electron-impact excitation of metastable 2p53s 3P2 substates has been studied by means of laser-induced fluorescence. The polarization of the fluorescence induced by polarized laser light has been used to determine the relative population of magnetic substates. Comparison with two recent calculations (R-matrix and RDW) is made. The apparent population of the magnetic substates at energies far above the excitation thresholds of higher-lying states is strongly influenced by cascading. Below 20 eV the experimental values show the correct tendency towards the threshold laws for LS coupling. Apart from depolarization problems associated with the experimental method, there remain significant discrepancies between the R-matrix and the RDW predictions.
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