Dielectric function of solid C70 films

Song Lin Ren, Kai An Wang, Ping Zhou, Ying Wang, A. M. Rao, M. S. Meier, J. P. Selegue, P. C. Eklund

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Using variable-angle ellipsometry and normal incidence reflection/ transmission optical techniques we have measured the dielectric function ε(ω) at room temperature for solid C70 films over the photon energy range 0.5≤E≤5.3 eV. The onset of absorption across the highest-occupied-molecular-orbit (HOMO)-lowest-unoccupied-molecular-orbit (LUMO) gap is measured to be 1.25 eV. Furthermore, structure in the interband absorption at 2.41, 3.10, 3.50, and 4.45 eV is observed. The refractive index at zero frequency is estimated to be n(0)=1.94 as compared to the value n(0)=1.90, which we obtained for solid C60 from our previous study.

Original languageEnglish
Pages (from-to)124-126
Number of pages3
JournalApplied Physics Letters
Volume61
Issue number2
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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