APPEARANCE OF CRYSTAL-FIELD SPLITTING IN 2P-RESONANT ELECTRON-SPECTRAOF K+ IN IONIC SOLIDS

It is known that a well-developed spectator structure appears in the e lectron spectra of ionic potassium compounds when excited with photons at the K+ 2p absorption region (295 - 310 eV). This structure is due to the Auger-resonant inelastic scattering process 2p(6) + hv --> (2p( 5)3d) --> 3p(4)3d + e, in which the 2p-hole states (the absorption fin al states) serve as the intermediate states. Due to the circumstance t hat all the configurations which contain the 3d orbitals are subject t o a crystal-field splitting in solids, an interesting interplay of dif ferent bands of the electron spectra may be observed if the photon ene rgy resonates with different crystal-field components of the absorptio n spectrum. Experimentally some of the crystal-field effects are known from the comparison with each others the different spectra of KCl (he re the crystal-field splitting D is about 0.9 eV) and with KMnF3(D sim ilar to 0.06 eV). We have performed theoretical calculations in which the crystal-field effects are inserted into the usual atomic Hartree-F ock procedure. The calculations reproduce well the high-kinetic-energy parts of the electron spectra.