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Flame temperature measurements by radar resonance-enhanced multiphoton ionization of molecular oxygen

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Abstract

Here we report nonintrusive local rotational temperature measurements of molecular oxygen, based on coherent microwave scattering (radar) from resonance-enhanced multiphoton ionization (REMPI) in room air and hydrogen/air flames. Analyses of the rotational line strengths of the two-photon molecular oxygen C3Π(v=2)X3Σ(v=0) transition have been used to determine the hyperfine rotational state distribution of the ground X3Σ(v=0) state. Rotationally resolved 2+1 REMPI spectra of the molecular oxygen C3Π(v=2)X3Σ(v=0) transition at different temperatures were obtained experimentally by radar REMPI. Rotational temperatures have been determined from the resulting Boltzmann plots. The measurements in general had an accuracy of ±60K in the hydrogen/air flames at various equivalence ratios. Discussions about the decreased accuracy for the temperature measurement at elevated temperatures have been presented.

© 2012 Optical Society of America

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