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Calibration of the nitrogen vibron pressure scale for use at high temperatures and pressures

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5 Author(s)
Schmidt, S.C. ; Los Alamos National Laboratory, Los Alamos, New Mexico 87545 ; Schiferl, D. ; Zinn, A.S. ; Ragan, D.D.
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Coherent anti‐Stokes Raman scattering (CARS) and spontaneous Raman spectroscopy have been used to obtain vibrational spectra of shock‐compressed and static high‐pressure fluid nitrogen, respectively. Vibrational frequencies were obtained from the CARS data using a semiclassical model for these spectra. Spontaneous Raman vibrational frequencies were determined by fitting data using a Lorentz‐shape line. A functional form was found for the dependence of the vibrational frequency on pressure and temperature to 40 GPa and 5000 K, respectively. By fitting the vibrational data to this form, a pressure scale based on the fluid nitrogen vibron has been calibrated for use at very high temperature. The nitrogen vibron pressure scale was used to determine the fluid‐δ nitrogen phase boundary up to 20 GPa and 900 K.

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Journal of Applied Physics  (Volume:69 ,  Issue: 5 )