Abstract

The pressure and temperature dependence of background-free S-branch CARS spectra of N₂ are investigated in the temperature range of 300–700 K for pressures of 1–20 atm. Collisional narrowing for S-branch CARS spectra is proved to be negligible. Individual S-branch lines are clearly resolved in the entire range, enabling unequivocal determination of temperatures by their peak ratios. Advantages and disadvantages of S-branch CARS thermometry are discussed on the basis of experimental results. The dual narrowband Stokes CARS technique is also discussed as a practical method of S-branch CARS thermometry.

© 1990 Optical Society of America

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