HIGH-RESOLUTION COHERENT ANTI-STOKES RAMAN SPECTROSCOPY OF $H_{2}$

Author Institution: Department of Engineering Physics, Air Force Institute of Technology; Department of Engineering Physics, Air Force Institute of Technology; Department of Engineering Physics, Air Force Institute of TechnologyHigh-resolution Coherent Anti-Stokes Raman Spectroscopy (CARS) has been performed in hydrogen gas using a CW system employing single-mode Ar-ion and ring dye lasers. Accurate measurements of the Raman frequencies and line-widths of the Q(o) through Q(3) transitions of molecular hydrogen have been made at pressures ranging from 0.75 to 40 atm. All four lines exhibit the usual ``Dicke narrowing” and pressure broadening. The pressure-broadening and pressure-shift coefficients determined from the data are presented and their implications on diagnostic applications are discussed