Absorption Spectroscopy of Ionic and
Molecular Units in Crystals and Glasses
Peter
M. Bell, H. K. Mao
Geophysical Laboratory
Carnegie Institution of Washington
Washington, DC 20008
George R. Rossman
Division of Geological and Planetary
Sciences
California Institute of Technology
Pasadena, CA 91125
Abstract
All minerals have regions of strong absorption of electgromagnetic
radiation in the ultraviolet, visible or infrared portions of the
spectrum which arise from electronic and vibrational transitions of
various ions inthe mineals. The study of the ultraviolet spectra of
mineals is a comparatively neglected subject because the absorption
bands in the ultraviolet are so intense that it is ecperimental
difficult to prepare samples thin enough to transmit the amount of
light necessary for measurements of the spectra. The study of the
infrared spectra of mineals is an important and expanding field, and is
the topic of several of the following chapters in this bood. The region
in between, the visible and near-infrared portions of the spectrum
extending from 400 to 2500 nm, is th spectral region discussed in this
chapter.
last
updated: 26-Jul-2023