Multiplet splitting and valence-shell recoupling in the core-level 2p photoelectron spectrum of atomic Mn and of Mn compounds

The $2p$ photoelectron spectrum of free Mn atoms is presented. The experimental results are interpreted with the aid of Hartree-Fock calculations. Multiplet splitting and valence-shell recoupling in the core excited state give rise to the numerous main and satellite lines observed. The strong influence of these intra-atomic interactions on the Mn $2p$ photoelectron spectra of Mn compounds is verified by comparison of the corresponding spectra.