Vibrational spectroscopy in high-temperature dense fluids

David S. Moore; Stephen C. Schmidt

doi:10.1117/12.59306

14 May 1992 Vibrational spectroscopy in high-temperature dense fluids

David S. Moore, Stephen C. Schmidt

Author Affiliations +

Proceedings Volume 1636, Applied Spectroscopy in Materials Science II; (1992) https://doi.org/10.1117/12.59306
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

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.

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David S. Moore and Stephen C. Schmidt "Vibrational spectroscopy in high-temperature dense fluids", Proc. SPIE 1636, Applied Spectroscopy in Materials Science II, (14 May 1992); https://doi.org/10.1117/12.59306

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