Quantitative evaluation of sp/sp(2) hybridization ratio in cluster-assembled carbon films by in situ near edge X-ray absorption fine structure spectroscopy

We present a near edge X-ray absorption fine structure spectroscopy characterization of nanostructured carbon films containing carbynoid species. By a careful data analysis and normalization of the spectra at the carbon K-edge we have quantitatively evaluated the extent of valence sp hybridization of the films. A sp/sp(2) ratio between 10% and 25% has been obtained. This result allowed the evaluation of the ratio between the sp and sp(2) Raman cross section at different excitation laser wavelengths. (C) 2005 Elsevier Ltd. All rights reserved.