FOURIER TRANSFORM MICROWAVE DETECTION OF FREE RADICALS RELEVANT TO COMBUSTIONAND ATMOSPHERIC CHEMISTRY

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Title: FOURIER TRANSFORM MICROWAVE DETECTION OF FREE RADICALS RELEVANT TO COMBUSTIONAND ATMOSPHERIC CHEMISTRY
Creators: Hansen, Nils; Mäder, H.; Temps, F.
Issue Date: 2000
Publisher: Ohio State University
Abstract: We report on first applications of a Laser Photolysis-Molecular Beam-Fourier Transform Microwave (LP-MB-FTMW) spectrometer in the spectral region 8 to 40 GHz, constructed for investigations of rotational spectra of free radicals. The experimental set-up consists of a near semi-confocal Fabry-Perot type microwave resonator mounted in a stainless steel vacuum chamber. The cavity resonance can be adjusted by moving the spherical mirror. A current actuated slit nozzle value is situated near the center of the flat mirror, just above the microwave antennas. The performance of the spectrometer was optimized by recording $SO (X^{3}\Sigma)$ microwave spectra. SO radicals were produced by 193 nm photodissociation of $SO_{2}$ in a pulsed supersonic free jet expansion in Ar. Additionally, first results of the LP-MB-FTMW detection of the $C_{2}H_{3} O$ (vinoxy) and of $CF_{2}$ radicals will be presented.
Description: Author Institution: Institut f\""ur Physikalische Chemie, Christian-Albrechts-Universit\""at Kiel
URI: http://hdl.handle.net/1811/19685
Other Identifiers: 2000-MH-01
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