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Sascha R. Engel, Joseph D. Miller, Chloe E. Dedic, Thomas Seeger, Alfred Leipertz and Terrence R. Meyer Hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering for high-speed CH4/N2 measurements in binary gas mixtures Journal of Raman Spectroscopy 44

Version of Record online: 27 FEB 2013 | DOI: 10.1002/jrs.4261

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Hybrid femtosecond/picosecond vibrational coherent anti-Stokes Raman scattering was demonstrated for high-speed, in situ measurements of CH4/N2 mole fractions in binary gas mixtures with temporal nonresonant suppression. A typical accuracy of ~95% was achieved for CH4 mole fractions from 0.02-0.70, and a precision of ~4% was achieved by maximizing relative excitation energy through induced chirp in the pump and Stokes pulses. Furthermore, mole fraction measurements were not affected by variations in bi-molecular broadened linewidths over a wide range of mixture fractions.

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