Electronic structure of the hydrogenated diamond C(100)-(2 x 1):H surface

For the first time hydrogen induced surface states were experimentally observed on the hydrogenated diamond C(1 0 0)-(2 x 1):H surface. The photoemission spectra of the clean, ex situ and in situ hydrogenated diamond (1 0 0) surface were recorded at grazing incident angles in order to improve the surface sensitivity. The careful analysis of the photoemission spectra, recorded at different photon energies, indicates the presence of the hydrogen induced states in the valence band. The photoemission spectra, measured at different incident angles, suggest the surface character of the hydrogen induced states. These surface states, located at 8.8, 11.3-11.5 and 16.9 eV, displayed a slight dispersion with the photon energy and were interpreted as C-H surface states of the C(1 0 0)-(2 x 1):H surface. (C) 2001 Elsevier Science B.V. All rights reserved.