High-resolution coherent anti-stokes raman spectroscopy measurements of carbon monoxide linewidths in a flame

Abstract

We have used a high-resolution (0.005 cm −1 ) coherent anti-Stokes Raman spectroscopy (CARS) experiment to obtain fully resolved CARS spectra in a flame. Spectra of Q -branch transitions of CO and O -branch transitions of N 2 were analyzed to obtain J-dependent Raman linewidths. The CO linewidths are compared to infrared P- and R-branch linewidths measured by other workers in similar rich methane/air flames. The results demonstrate the utility of high-resolution CARS for providing spectral information needed for applying conventional CARS to combustion environments.