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Title: Coherent anti-Stokes Raman spectroscopy of shock-compressed liquid oxygen

Abstract

Vibrational spectra of liquid oxygen, shock compressed to several high-pressure/high-temperature states, were obtained using single- pulse multiplex coherent anti-Stokes Raman scattering (CARS). The experimental spectra were compared to synthetic spectra calculated using a semiclassical model for the CARS intensities and best fit vibrational frequencies, peak Raman susceptibilities, and Raman linewidths. Up to the maximum shock pressure of 9.6 GPa, the vibrational frequencies were found to increase monotonically with pressure. An empirical fit, which could be used as a pressure/temperature/frequency calibration standard, showed that the Raman frequency shifts could be accurately described by linear pressure and temperature dependences. Above /approx/9 GPa, the liquid oxygen opacity at 632.8 nm increased rapidly, presumably because of proximity (collision)-induced absorption. Calculations showed that the induced absorption did not resonantly enhance the CARS spectra, but did attenuate the laser beams and the CARS signals. 33 refs., 2 figs., 1 tab.

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA)
OSTI Identifier:
5762975
Report Number(s):
LA-UR-89-2423; CONF-890812-5
ON: DE89015411
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: American Physical Society topical conference on shock compression of condensed matter, Albuquerque, NM, USA, 14-17 Aug 1989; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; OXYGEN; RAMAN SPECTROSCOPY; EQUATIONS OF STATE; IMPACT SHOCK; LIQUEFIED GASES; PRESSURE DEPENDENCE; TEMPERATURE DEPENDENCE; THERMODYNAMIC PROPERTIES; VIBRATIONAL STATES; ELEMENTS; ENERGY LEVELS; EQUATIONS; EXCITED STATES; LASER SPECTROSCOPY; NONMETALS; PHYSICAL PROPERTIES; SPECTROSCOPY; 400102* - Chemical & Spectral Procedures

Citation Formats

Schmidt, S.C., Moore, D.S., Shaw, M.S., and Johnson, J.D. Coherent anti-Stokes Raman spectroscopy of shock-compressed liquid oxygen. United States: N. p., 1989. Web.
Schmidt, S.C., Moore, D.S., Shaw, M.S., & Johnson, J.D. Coherent anti-Stokes Raman spectroscopy of shock-compressed liquid oxygen. United States.
Schmidt, S.C., Moore, D.S., Shaw, M.S., and Johnson, J.D. Sun . "Coherent anti-Stokes Raman spectroscopy of shock-compressed liquid oxygen". United States. https://www.osti.gov/servlets/purl/5762975.
@article{osti_5762975,
title = {Coherent anti-Stokes Raman spectroscopy of shock-compressed liquid oxygen},
author = {Schmidt, S.C. and Moore, D.S. and Shaw, M.S. and Johnson, J.D.},
abstractNote = {Vibrational spectra of liquid oxygen, shock compressed to several high-pressure/high-temperature states, were obtained using single- pulse multiplex coherent anti-Stokes Raman scattering (CARS). The experimental spectra were compared to synthetic spectra calculated using a semiclassical model for the CARS intensities and best fit vibrational frequencies, peak Raman susceptibilities, and Raman linewidths. Up to the maximum shock pressure of 9.6 GPa, the vibrational frequencies were found to increase monotonically with pressure. An empirical fit, which could be used as a pressure/temperature/frequency calibration standard, showed that the Raman frequency shifts could be accurately described by linear pressure and temperature dependences. Above /approx/9 GPa, the liquid oxygen opacity at 632.8 nm increased rapidly, presumably because of proximity (collision)-induced absorption. Calculations showed that the induced absorption did not resonantly enhance the CARS spectra, but did attenuate the laser beams and the CARS signals. 33 refs., 2 figs., 1 tab.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Conference:
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