Abstract

We report direct measurement of collisional line-broadening coefficients associated with rotational Raman transitions of carbon monoxide (CO), obtained using time-resolved picosecond rotational coherent anti-Stokes Raman scattering spectroscopy. The dependencies of the CO self-broadening coefficients on rotational quantum number, $J$, and temperature are described for the $J=3–16$ lines of $S$-branch ($\mathrm{\Delta }J=+2$) transitions for $T=295–600\mathrm{K}$ at atmospheric pressure. Further, we report collisional linewidths of CO and collision partners ${\mathrm{N}}_2$ and ${\mathrm{CO}}_2$. The obtained $S$-branch linewidths of self-broadened CO agree well with previously reported frequency-domain experimental spectroscopy results, whereas the mixture-linewidth broadening coefficients differ from reported theoretical results by up to 80%.

© 2019 Optical Society of America

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