Abstract
We have determined the anisotropy parameter $\ensuremath{\beta}$ for the electron angular distribution in direct $2p$ photoionization of free Mn and Cr atoms. By using a high-resolution electron spectrometer and by rotating the polarization axis of the linearly polarized synchrotron radiation the values for $\ensuremath{\beta}$ could be derived with high precision and separately for the different multiplet components. Combination of the experimental results with Hartree-Fock based single configuration and multiconfiguration ab initio calculations gives new insight into the atomic $3d$-metal $2p$ photoionization process. Configuration interaction in the final ionic states need to be taken into account to adequately describe the measured photoelectron angular distributions.
Published Version
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