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The unoccupied density of states of diamond films is studied by means of appearance potential spectroscopy (APS). A comparison between the experimental spectra and spectra calculated using a theoretical unoccupied density of states shows reasonable agreement with respect to the energy position of the main spectral features. The entire agreement can be improved if an energy-dependent life-time broadening of the unoccupied states is included. The gradual transformation of the diamond films to graphite by means of sputtering and annealing is monitored by APS. The results show that APS allows for a clear differentiation between sp(3)-hybridized carbon (diamond) and sp(2)-hybridized carbon (graphite).

Additional information

Authors: RANGELOV G, Universität Bayreuth, Experimentalphysik III (DE);DOSE V, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Surface Science, Vol. 395 (1998) pp. 1-9
Record Number: 199810533 / Last updated on: 1998-05-05
Original language: en
Available languages: en