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


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