Abstract
Angle resolved photoelectron spectra of 1T-TiSe2 single crystals (h̵ω = 21.2 eV) have been investigated as a function of exposure to H2O, CO, N2 and O2 at room temperature. A significant enhancement of the Ti-3d emission near the Fermi energy EF is observed for H2O and CO exposures of several kL. As compared to the clean surface this emission extends over the entire Brillouin zone. The results indicate that by H2O and CO adsorption the lowest d-subband is pulled below EF possibly by local band bending. Additional relaxation effects at the surface associated with changes in d-band matrix elements may occur. The intensity of the Se-4p derived valence band emission down to 7 eV below EF remains essentially unchanged.
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