HIGH RESOLUTION, NEAR AND MID IR, JET-COOLED, CAVITY RING-DOWN SPECTROSCOPY WITH A NOVEL DISCHARGE EXPANSION
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Date
2006
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The frequency coverage of our CRDS spectrometer}, 2006 (Accepted, DOI: 10.1039/b518279d)} has been extended from the 1.0 -- 1.5 $\mu$m region to the 3 -- 3.5 $\mu$m region, which opens exciting opportunities for studying the C-H fundamental vibrational modes of molecules and free radicals. Furthermore, higher resolution has been provided by using difference frequency generation (DFG) based on a Fourier transform limited Ti:Sapphire pulse-amplified laser}, 2005, TJ10}. As an example, the jet-cooled spectra of the CH$_3$ radical with partially resolved hyperfine structures will be presented. Non-exponential effects in the ring-down decay have also been minimized by using the narrow bandwidth radiation. Additionally, a novel transverse discharge arrangement had been designed to improve stability, and also to provide a capability of mixing chemical reagents downstream. We will present preliminary spectral results and kinetic analyses characterizing this radical source.
Description
Author Institution: Department of Chemistry, The Ohio State University, 120 W. 18$^{th}$ Ave., Columbus OH, 43210