Abstract
The photoionisation spectrum of atomic selenium, prepared by the reaction of H atoms with H2Se, is presented from its ionisation threshold to 600 AA. Autoionisation peaks assigned to quasidiscrete levels . . .(2D degrees )nd 3p degrees are sharp, those assigned to . . .(2D degrees )ns 3D degrees and . . .(2D degrees )nd 3S degrees are somewhat broader, and others assigned to . . .(3D degrees )nd 3D degrees are very broad. A few members of the series converging to Se+(2P degrees ) are also observed. Two prominent peaks are tentatively assigned to 4s4p5 3P degrees 2,1, and taken to be the first members of the series . . . 4s4p4np, the latter appearing as window resonances in this spectrum. The photoionisation spectrum of H2Se is also presented.
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