Partial and total cross sections and multiplet structure in the photoionization of atomic manganese

We determined the absolute partial photoionization cross section {σ} and the angular distribution parameter {β} of the 3d, 3p, and 3s photoelectrons in atomic manganese for 65{≤}h{ν}{≤}250 eV. The total photoionization cross section is in satisfactory accord with the single-particle Hartree-Slater calculation and in very good agreement with a relativistic time-dependent local-density-approximation calculation. Binding energies and intensity ratios of the 3s^-1 and 3p^-1 multiplet lines were obtained. Five lines were identified within the 3p^-1 multiplet, and the measured spacings are close to those found in solid MnF₂. Similarly, the spacings in the 3s^-1 multiplet are equal to the ones measured in solid MnF₂. There is good accord between our results for the angular-distribution parameter of the 3p^-1 (⁷P) line and those of Malutzki et al. [J. Phys. B 18, 1735 (1985)]. The intensity ratios of ⁵P(1) to ⁷P and ⁵S(1) to ⁷S were seen to increase slowly somewhat above their thresholds. More rapid variations of all multiplet ratios were found within about 30 eV of threshold.