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

For the first time hydrogen induced surface states were experimentally obse rved on the hydrogenated diamond C(1 0 0)-(2 x 1):H surface. The photoemiss ion 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 su rface sensitivity. The careful analysis of the photoemission spectra, recor ded at different photon energies, indicates the presence of the hydrogen in duced states in the valence band. The photoemission spectra, measured at di fferent incident angles, suggest the surface character of the hydrogen indu ced states. These surface states, located at 8.8, 11.3-11.5 and 16.9 eV, di splayed 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 Sci ence B.V. All rights reserved.