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≤hν≤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 3$s^{\mathrm{-}1}$ and 3$p^{\mathrm{-}1}$ multiplet lines were obtained. Five lines were identified within the 3$p^{\mathrm{-}1}$ multiplet, and the measured spacings are close to those found in solid ${\mathrm{MnF}}_2$. Similarly, the spacings in the 3$s^{\mathrm{-}1}$ multiplet are equal to the ones measured in solid ${\mathrm{MnF}}_2$. There is good accord between our results for the angular-distribution parameter of the 3$p^{\mathrm{-}1}$ ${(}^7$P) line and those of Malutzki et al. [J. Phys. B 18, 1735 (1985)]. The intensity ratios of ${}_{}{}^5{}_{}{}^{}\mathrm{P}$(1) to ${}_{}{}^7{}_{}{}^{}\mathrm{P}$ and ${}_{}{}^5{}_{}{}^{}\mathrm{S}$(1) to ${}_{}{}^7{}_{}{}^{}\mathrm{S}$ were seen to increase slowly somewhat above their thresholds. More rapid variations of all multiplet ratios were found within about 30 eV of threshold.