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Proceedings Paper

Vibrational spectroscopy in high-temperature dense fluids
Author(s): David S. Moore; Stephen C. Schmidt
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Paper Abstract

Coherent anti-Stokes Raman spectroscopy (CARS) in conjunction with a two-stage light-gas gun has been used to obtain vibrational spectra of shock-compressed liquid N2, 02, CO, and their mixtures, as well as liquid N20. The experimental spectra are compared to spectra calculated using a semiclassical model for CARS intensities to obtain vibrational frequencies, peak Raman susceptibilities, and linewidths. The derived spectroscopic parameters suggest thermal equilibrium of the vibrational populations is established in less than a few nanoseconds after shock passage. Vibrational temperatures obtained are compared to those derived from equation-of-state calculations. The variation of the vibrational frequency shift at pressure with species concentration in mixtures is investigated.

Paper Details

Date Published: 14 May 1992
PDF: 7 pages
Proc. SPIE 1636, Applied Spectroscopy in Materials Science II, (14 May 1992); doi: 10.1117/12.59306
Show Author Affiliations
David S. Moore, Los Alamos National Lab. (United States)
Stephen C. Schmidt, Los Alamos National Lab. (United States)


Published in SPIE Proceedings Vol. 1636:
Applied Spectroscopy in Materials Science II
William G. Golden, Editor(s)

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