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

Conference · Sun Jan 01 00:00:00 EST 1989

DOI:https://doi.org/10.1063/1.457345· OSTI ID:5762975

Schmidt, S C; Moore, D S; Shaw, M S; Johnson, J D

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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5762975
• Report Number(s): LA-UR-89-2423; CONF-890812-5; ON: DE89015411
• Resource Relation: Journal Volume: 91; Journal Issue: 11; 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

Related Subjects

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