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Appl Opt. 2007 Jul 1;46(19):3911-20.

Investigation of OH X(2)II collisional kinetics in a flame using picosecond two-color resonant four-wave-mixing spectroscopy.

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  • 1Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, USA.


Time-resolved two-color resonant four-wave-mixing spectroscopy was used to investigate collisions affecting the ground electronic state of the hydroxyl radical. Picosecond laser pulses provided adequate time resolution for measurements in an atmospheric-pressure methane-air flame. The grating spectroscopy technique used a combination of double resonance, time-delayed probing, and independent control of the polarization of each of the four fields involved in the wave-mixing process to enable measurement of the decay of laser-induced population, alignment, and orientation, as well as state-to-state transfer of these three moments. Results are presented for individual rotational levels of OH in X(2)II(3/2)(v=1).

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