INVESTIGATION OF THE METHYLENE AMIDOGEN RADICAL USING THE CRDS TECHNIQUE
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Date
2002
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Ohio State University
Abstract
Cavity ringdown spectroscopy (CRDS) was used to study room temperature chemical reactions of the methylene amidogen radical $(CH_{2}N)$. The radical was prepared by 193 nm photolysis of formaldoxime, $CH_{2}NOH \rightarrow CH_{2}N+OH$. CRDS signal from both $CH_{2}N$ and OH [A-X (1,0) band] was observed in the wavelength region 278-288 nm. By comparison of the OH and $CH_{2}N$ signals, absorption cross section of the $CH_{2}N$ was determined. To correct for the loss of OH radical by reaction, the rate constant of the reaction of OH with formaldoxime was measured, $k(CH_{2}NOH+OH)= 2.5^{\ast} 10^{-12}$ molecule $cm^{3} s^{-1}$. Reaction of $CH_{2}N$ with stable molecules such oxygen, hydrogen and methane could not be observed and only an upper limit of the reaction rate constants, $< 1.0 ^{\ast}10^{-15}$ molecule $cm^{3} s^{-1}$, could be derived. Self-recombination was the main removal process for the $CH_{2}N$ radical under the conditions of our experiment.
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Author Institution: Department of Chemistry, The Johns Hopkins University