Abstract
Here we report non-intrusive local rotational temperature measurements of molecular oxygen, based on coherent microwave scattering (Radar) from REMPI (Resonance Enhanced Multi-Photon Ionization) in pure oxygen and air with subsequent analysis of the hyperfine rotational state distribution. Rotationally resolved 2+1 REMPI spectra of molecular oxygen (C 3 Π (v=2) ← X 3 Σ (v’=0)) at different temperatures have been obtained by Radar REMPI. Rotational temperatures have been determined from the Boltzmann plots of various experiments for up to 500 o C. The overall measurements have an accuracy of 60K in the pure oxygen and 50K in the room air for up to 500 o C.
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