Rotational Raman intensity-correction factors due to vibrational anharmonicity: their effect on temperature...

Temperatures can be measured from relative intensities of rotational Raman or rotational coherent anti-Stokes Raman scattering (CARS) from ground and vibrationally excited molecules, provided that relative Raman line strengths are known. Here rotational Raman line strengths are calculated and corrected for vibrational anharmonicity, for N(2), O(2), CO, and H(2). These line-strength-correction factors for vibrational anharmonicity have a pronounced effect on temperature calculations; they lower temperatures previously calculated from O(2) rotational CARS intensities at approximately 3000 K by more than 300 K.