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

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.

Citation Download Citation

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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