The core and valence levels of beta-PbO(2) have been studied using hard X-ray photoemission spectroscopy (hv = 6000 eV and 7700 eV). The Pb 4f core levels display an asymmetric lineshape which may be fitted with components associated with screened and unscreened final states. It is found that intrinsic final state screening is suppressed in the near-surface region. A shift in the O 1s binding energy due to recoil effects is observed under excitation at 7700 eV. It is shown that conduction band states have substantial 6s character and are selectively enhanced in hard X-ray photoemission spectra. However, the maximum amplitude in the Pb 6s partial density of states is found at the bottom of the valence band and the associated photoemission peak shows the most pronounced enhancement in intensity at high photon energy.
Payne, D.j., Paolicelli, G., Offi, F., Panaccione, G., Lacovig, P., Beamson, G., et al. (2009). A study of core and valence levels in beta-PbO(2) by hard X-ray photoemission. JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 169(1), 26-34 [10.1016/j.elspec.2008.10.002].
A study of core and valence levels in beta-PbO(2) by hard X-ray photoemission
OFFI, FRANCESCO;
2009-01-01
Abstract
The core and valence levels of beta-PbO(2) have been studied using hard X-ray photoemission spectroscopy (hv = 6000 eV and 7700 eV). The Pb 4f core levels display an asymmetric lineshape which may be fitted with components associated with screened and unscreened final states. It is found that intrinsic final state screening is suppressed in the near-surface region. A shift in the O 1s binding energy due to recoil effects is observed under excitation at 7700 eV. It is shown that conduction band states have substantial 6s character and are selectively enhanced in hard X-ray photoemission spectra. However, the maximum amplitude in the Pb 6s partial density of states is found at the bottom of the valence band and the associated photoemission peak shows the most pronounced enhancement in intensity at high photon energy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
