This study measures the x-ray-absorption spectra of a series of nanodiamond thin films with grain diameters ranging from 3.5 nm to 5 mm at the C K-edge using the sample drain current mode at room temperature. Resonance peaks resembling the C 1s core exciton are observed. The exciton state and conduction band edge are found to shift to higher energies with the decrease of the grain size indicative of the presence of the quantum confinement effect. [S0031-9007(99)

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X-ray-absorption near edge structure ͑XANES͒ measurements have been performed to investigate the local electronic structures of the Fe-catalyzed and stabilized carbon nanotubes ͑CNT͒ with various diameters. The intensities of the *and *-band and the interlayer-state features in the C K-edge XANES spectra of these CNTs vary with the diameter of the CNT. The white-line features at the C K-and Fe L 3 -edges suggest a strong hybridization between the C 2p and Fe 3d orbitals, which lead to an enhancement of the C K-and reduction of the Fe L 3 -edge features, respectively, indicative of a charge transfer from C 2p to Fe 3d orbitals. The Fe K-edge spectra reveal a p -d rehybridization effect that reduces p-orbital occupation at the Fe site.