Intra-shell transitions of 3D metal ions (Fe, Co, Ni) in II-VI wide-gap semiconductor alloys

We analyse ionisation and intra-shell transitions of iron, nickel and cobal t in bulk crystals of CdSe, ZnSe and ZnS and in their alloys. A multi-charg e state of transition metal ions and observed nonlinear shifts of their int ra-shell transitions clearly demonstrate deviations from the predictions of the Ludwig-Woodbury model, Studies of ionisation transitions allow us to v erify the recent theoretical predictions on universal-reference-level due t o transition metal ions. We report a relatively good agreement between pred ictions of the universal-level-model and band offsets in ZnCdSe/ZnSe and Zn Se/ZnSSe heterostructures. (C) 1999 Elsevier Science B.V. All rights reserv ed.