RADIATION-DAMAGE STUDIES BY X-RAY PHOTOELECTRON-SPECTROSCOPY .2. ELECTRON-IRRADIATED LI2CRO4 AND LI2WO4 Academic Article uri icon

abstract

  • Single crystals of Li2CrO4 and Li2WO4 were irradiated insitu with 0.31.6 keV electrons in an UHV x-ray photoelectron spectrometer. Chemical shifts of core-level peaks in XPS spectra indicate formation of Cr(III) on the irradiated Li2CrO4 surface and of W (IV) and W (V) on the irradiated Li2WO4 surface. Accompanying formation of the reduced species, new peaks attributable to photoelectrons from non-bonding orbitals appear at binding energies just below the respective Fermi levels. A lower limit of the G value for Cr(III) formation is estimated to be about 1.3102 from the differential energy loss of the incident electrons. Comparison of this G value with previous data determined by ESR suggests that solid surfaces are far more sensitive to radiation damage than the bulk. The irradiation of Li2WO4 causes a shift in the entire XPS spectrum to lower binding energy, initially 2 eV, which decreases over a 20 h period until the original peak positions are recovered. This is interpreted in terms of surface charging caused by electron irradiation.

published proceedings

  • JOURNAL OF CHEMICAL PHYSICS

author list (cited authors)

  • SASAKI, T., WILLIAMS, R. S., WONG, J. S., & SHIRLEY, D. A.

citation count

  • 19

publication date

  • November 1978