INFRARED DIFFRACTION AND THE FAR INFRARED SPECTRA OF ANHYDROUS SULFATES

Abstract

A phenomenon analogous to X-ray diffraction and described as infrared diffraction has been obtained by mathematical analysis, between the absorption bands of the SO₄ molecule in solution, and those of crystals of anglesite, barite, celestite, and anhydrite. The absorption bands of the fundamental vibrational mode are discussed for each mineral. From the results, it has been concluded that relationships showing wave motions exist between the bands of the spectrum. Infrared spectra are calculated by using the damped equation in the wave number region from 2000 to 100cm^-1. The features of the calculated spectra are similar to those of the spectrum obtained by using infrared spectrophotometers.