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