Infrared ellipsometric determination of the optical constants of polytetrafluoroethylene

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• 作者：Korte ; Ernst-Heiner ; Rö ; seler ; Arnulf
• 关键词：Infrared ; Ellipsometry ; Optical constants ; Infrared refractive index ; Polytetrafluoroethylene
• 刊名：Journal of Molecular Structure
• 出版年：2003
• 出版时间：December 16, 2003
• 年：2003
• 卷：661-662
• 期：Complete
• 页码：579-585
• 全文大小：227 K

文摘

The infrared spectra of the refractive index, n, and of the absorption index, k, of polytetrafluoroethylene were determined ellipsometrically. It was confirmed that the sample is thick enough to apply a direct evaluation at every spectral data point and does not show measurable anisotropy. A set of oscillators was specified to reproduce the experimental spectra. Two of the bands between 1600 and 500 cm⁻¹ are intense enough to cause the refractive index to fall below unity. The related optical features and remaining deviations are discussed.