VI-Q-3 Polarized VUV Absorption and Reflection Spectra of Oriented Films of Poly-(tetrafluoroethylene) (CF₂)_n and its Model Compound

Kohei NAGAYAMA,* Takayuki MIYAMAE, Ryuichi MITSUMOTO,* Hisao ISHII, Yukio OUCHI* and Kazuhiko SEKI* (*Nagoya Univ.)

[J. Electron Spectrosc. Relat. Phenom. 78, 407 (1996)]

Polarized vacuum-UV absorption and reflection spectra were measured for oriented films of plytetrafluoroethylene(PTFE)(CF₂)_n and its model compound perfluorotetracosane (PFT) n-C₂₄F₅₀. The lowest energy excitation leading to an intense peak was found to be polarized along the molecular chain, and its energy decreases with the chain length (8.05eV for PFT and 7.66eV for PTFE). The polarization and chain-length dependence are discussed with the aid of information by theoretical calculation, NEXAFS, and electron transmission spectroscopy.

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