T. Uozumi et al., Theoretical and experimental study of resonant 3d X-ray photoemission and resonant L3M45M45 Auger transition of PdO, J PHYS JPN, 69(4), 2000, pp. 1226-1233
The observed 3d X-ray photoemission spectra (XPS), resonant 3dXPS (RXPS) at
the L-3 edge and resonant L3M45M45 Auger electron spectra (RAES) of 4d tra
nsition metal oxide PdO are successfully analyzed by means of an impurity A
nderson model. The importance of Pd 4d-O 2p hybridization effect is especia
lly emphasized in the interpretation of observed spectra. It causes charge
transfer satellites in 3dXPS and L(3)M(45)M(45)RAES and mainly determines t
he structure of resonance enhancements in 3dRXPS. From the analysis of spec
tra, 4d - 2p charge transfer energy Delta; 4d correlation energy U-dd and 4
d - 2p transfer integral pda are estimated to be 5.5 eV, 4.5 eV and 2.1 eV,
respectively. The character of the insulating energy gap of PdO is also th
eoretically investigated: PdO is classified as an intermediate-type insulat
or due to the strong 4d - 2p hybridization.