Enhancement of Raman Scattering Intensity Due to an Internal-Field Factor

Enhancement of intensity of Raman scattering signals of gas-media components due to an internal-field factor induced by molecular environment is analyzed. Intensity of fundamental vibrational-rotational Raman band of nitrogen in mixtures with argon and methane at pressures of up to 50 atm is investigated. It is established that intensity of Raman signals of nitrogen at its fixed concentration in the mixtures varies within 4% depending on pressure and environment. A model describing this effect is proposed. Obtained data allow improving the accuracy of gas analysis based on Raman spectroscopy.