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Optical Properties of C60 and M6C60 (M=K, Rb, Cs) films

  • S. L. Ren (a1), Ying Wang (a1), M. Holden (a1), A. M. Rao (a1), F. Ni (a2), W. Lee (a2), G. T. Hager (a2) and P. C. Eklund (a1) (a2)...

Abstract

We report the optical properties of C60 determined from the variable angle ellipsometry and near normal incidence reflection / transmission (R.T) experiments, and of M6C60 from the R, T experiments. The measurements were performed on thin films (d∼1000 Å) of C60 and M6C60 deposited on both Si(100) and suprasil substrates. The onset for strong absorption across the HOMO-LUMO gap in CgQ is measured to be -2.3 eV, slightly larger than the gap values obtained from the x-ray photoelectron spectroscopy (XPS) and electron-energy-loss spectroscopy (EELS) experiments. The observed peak positions in ε2(ω) for M6C60 and C60 compares well with the recent band structure calculations and suggests that the M6C60 compounds exhibit only a weak hybridization between the C60 and M states.

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Optical Properties of C60 and M6C60 (M=K, Rb, Cs) films

  • S. L. Ren (a1), Ying Wang (a1), M. Holden (a1), A. M. Rao (a1), F. Ni (a2), W. Lee (a2), G. T. Hager (a2) and P. C. Eklund (a1) (a2)...

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