Frequency Shift Measurements of the Q(1) and Q(2) Lines of H2 Using High Resolution CW Coherent Anti-Stokes Raman Spectroscopy
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Linear and quadratic frequency shift coefficients were determined for the Q1 and Q2 lines of hydrogen using cw Coherent Anti-Stokes Raman Spectroscopy CARS. The linear coefficients were accurate to three significant digits which is an order of magnitude better than any other published results. The quadratic coefficients were comparable to other reported results because of the range of pressures investigated in this study. Frequency stabilization of the Argon-ion laser allowed accurate measurements of the frequency shifts over a range of 2 to 40 atmospheres. A Fabry-Perot interferometer provides a relative frequency marker and iodine absorption peaks provided an absolute frequency reference. The coefficients determined were compared to those calculated by other researchers using different experimental methods. The high accuracy of the measurements added further credence to the effectiveness of cw CARS as a high resolution spectroscopic tool. Keywords Coherent Anti-Stokes Raman Spectroscopy Hydrogen Frequency shift.
- Atomic and Molecular Physics and Spectroscopy