Abstract

The electronic states of diamond-like hydrogenated carbon (DLC) films were studied by synchrotron radiation photoelectron spectroscopy. The valence band spectra measured at different excitation energies show the gradual emergence of the <i>p</i>-π band in relation to the sample annealing and ion bombardment amorphization. The <i>p</i>-π band of the annealed DLC was characterized by localized <i>p</i>_<i>z</i> states, while the formation of the amorphous carbon surface was accompanied by appearance of the delocalized <i>p</i>_<i>z</i> states, which reduce the optical gap. A simple approach permitting the extraction of the 2<i>p</i> band shape from the photoelectron spectra is proposed.

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