Optical properties of nickel (d9) in GaP and ZnSe

Abstract
Photoionisation of nickel (d9) to the conduction band has a threshold 0.8 eV in GaP and 1.0 eV in ZnSe. The internal d shell transition gives a zero phonon line at 3261 cm-1 (0.404 eV) in ZnSe. Using photocapacitance methods sharp peaks are seen near the photoionisation thresholds; these do not appear in absorption measurements. The origin of these peaks is not understood.
Keywords