Absorption Coefficients of Overtone and Combination Modes of Quartz

Keiji Shinoda and Nobuyuki Aikawa
Department of Geosciences, Faculty of Science, Osaka City University, Sugimoto 3-3-138, Sumiyoshi, Osaka 558, Japan

Abstract: The a-, σ- and π-spectra of quartz in the IR regions were measured under FTIR spectroscopy, and overtone and combination modes perpendicular to the c-axis of quartz were confirmed to be electric vector active by the coincidence of the a-spectrum with the σ-spectrum among the three kinds of spectra. Absorption coefficients of overtone and combination modes intrinsic to the a- σ-, and п-spectra of quartz were measured. The thickness of quartz thin sections can be determined by applying the absorption coefficients obtained from the α- and σ-spectra to the polarized IR absorption spectra measured under E ⊥ the c-axis.

Keywords: polarized absorbance spectrum • absorption coefficient • thickness determination • quartz

Mineralogical Magazine; December 1994 v. 58; no. 393; p. 601-606; DOI: 10.1180/minmag.1994.058.393.08
© 1994, The Mineralogical Society
Mineralogical Society (www.minersoc.org)