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New atomic cross-sectional data are reported in graphical and tabular form from the ionization threshold at 1378 Å down to 525 Å. The value of the photoionization cross-section at the threshold is 0.32 ± 0.6 Mb falling to 0.1 Mb in the region of 1200 Å and thereafter is dominated by autoionizing transitions. Configuration interaction between the levels of the (4d)9(5s25p multiplat is observed which causes the 3D1 level to interact strongly with the wings of the 3P1 level. The oscillator strengths for the (5s)21S0-(4d)9 (5s)2np1P1, 3P1 and 3D1 transitions converging on the 2D5/2, 3/2 ionic states are reported and an oscillator strength sum approaching unity is observed. Individual line oscillator strengths are compared with Hartree-Fock calculations of Wilson (1968).
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Marr et al. (1969) studied this question.
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