Abstract
With a high-resolution two-crystal vacuum spectrometer equipped with beryl crystals, the Zn Lα emission spectra in fluorescence have been measured for Zn metal, ZnO, cubic ZnS, hexagonal ZnS, ZnF2, ZnCl2, ZnBr2, ZnP2 and Zn3P2. The emission spectra consist of a prominent peak Lα 1, 2 and its high-energy structure, and are quite alike. The high-energy structure is primarily ascribed to the satellites as a result of multiple ionizations. The chemical shift is observed for the Lα 1, 2 peak: The energy position of the Lα 1, 2 peak is shifted toward lower energies with increasing the ionicity of the zinc compounds. The measured Zn Lα emission spectra are compared with available XPS, UPS and X-ray valence-band emission spectra and theoretical energy-band calculations on a common energy scale. It is shown that considerable p-d mixing occurs in the their valence band.
