Pressure-induced narrowing of the cars spectrum of N2☆

Abstract The coherent anti-Stokes Raman spectroscopy (CARS) spectrum of N 2 has been recorded experimentally over the pressure range from one to 100 atmospheres. The pressure dependence of the 300 K vibrational Q-branch signature is strongly affected by collisional narrowing. A theoretical model of CARS generation for overlapping spectral lines gives good agreement with the experimental results over the entire pressure range.