Abstract
The alignment of the 2p53s2 2P3/2 autoionizing state in sodium after electron-impact excitation was determined via the angular anisotropy of the intensity I() of the autoionization electrons. For emission angles 90°, the intensities I() were measured by rotating the incident electron gun, whereas magnetic-field deflection was applied for larger angles. Near-threshold negative-ion resonance structures in the alignment of an autoionizing state were observed for the first time and are discussed in detail. R-matrix calculations for incident electron energies from threshold to 80 eV successfully reproduced the broad-scale energy dependence of the alignment. The cross section ratio for the fine-structure components 2p53s2 2P3/2 and 2P1/2 were also measured and reproduced satisfactorily by theory.
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