The intensity of amphibole OH bands in the infrared absorption spectrum |
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Authors: | Henrik Skogby George R Rossman |
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Institution: | 1. Division of Geological and Planetary Sciences, California Institute of Technology, 91125, Pasadena, CA, USA
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Abstract: | Polarized IR spectra of single-crystals of amphiboles show that the molar absorptivity of the fundamental vibrational OH band is strongly wavenumber dependent. The intensity increases by a factor of 1.6 from 3674 cm-1 (tremolite endmember; MgMgMg) to 3618 cm-1 (grunerite endmember; FeFeFe). Spectra obtained from Ca and Fe-Mg amphiboles consist of sharp, well-resolved bands on a well-defined background. The high intensity of the OH bands in Ca and Fe-Mg amphiboles makes it sometimes necessary to thin the samples to under 2 μm thickness, whereas alkali amphiboles can be measured at 25–50 μm thickness. |
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