Abstract
Coherent anti-Stokes Raman spectroscopy (CARS) has received wide acceptance in combustion research for the measurement of temperature and major species concentrations. The CARS signal, however, depends nonlinearly on the Raman susceptibility of the combustion gases and leads to a need for accurate spectral models of combustion gases being studied. For molecular nitrogen, important in CARS thermometry and concentration measurements, knowledge of the collisional broadening coefficients of the O-branch due to major combustion species is a fundamental requirement for the spectral model. We report recent high-resolution inverse Raman measurements of nitrogen Q-branch linewidths in the postflame gases of an H2–O2–N2 flame at 1570 K.
© 1986 Optical Society of America
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