Absorption Spectroscopy in Solids Under Shock Compression

T Goto, G.R. Rossman, T.J. Ahrens
Division of Geological and Planetary Sciences
California Institute of Technoogy
Pasadena, CA 91125

Abstract

Experimental techniques that allow measurement of the optical absorption spectra of solids during the short time interval that they can be compressed dynamically offer the opportunity to supplement the more familiar equation of state data, which are usually reported in the form of a Hugoniot curve, with knowledgw of the transition element (cation) coordination environment, charge transfer energy spectrum, and population of electronic states at high (dyanmic pressures. In principle, shock pressures in excess of 100 GPa (1 Mbar) can be obtained; moreover, the absolute pressures are known for any given experiment to ~1%. The spectral range, however, is limited to about 350 to 700 nm by the response of photographic film. Thus spectroscopyundere dynamic compression offers both advantages and disadvantages with respect to the gathering of spectral data in static high-pressure equipment.

last updated: 24-Jul-2023