INFRARED DIODE LASER ABSORPTION SPECTROSCOPY OF HOCO AND DOCO RADICALS
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Date
1990
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Ohio State University
Abstract
Several infrared bands of the HOCO and DOCO radicals were previously observed in CO $matrices^{1}$. The band origin of the $C=O$ vibrational stretching mode was determined to be 1833 and $1825 cm^{-1}$ for trans-HOCO and DOCO, $respectively^{1}$. We report what is believed to be the first gas phase observation of these reactive radicals. The HOCO and DOCO were produced by excimer laser photolysis of $CH_{3}COOH, CH_{3}COOD$. and $CD_{3}COOD$ at 193nm. Relatively strong and congested ro-vibrational spectra were detected by diode laser absorption around $1860 cm^{-1}$. We assigned these transitions to the $C=O$ stretch of HOCO and DOCO. This assignment was supported by chemical evidence and effects of H/D exchange on the observed spectrum. We are currently searching for more transitions. Experimental results and preliminary analysis of the observed spectra will be presented.
Description
$^{1}$ D. E. Milligan and M. E. Jacox, J. Chem. Phys. 54, 927(1971). Work at Brookhaven National Laboratory was carried out under contract DE-ACO2-76CH00016 with the U,S. Department of Energy and supported by its Division of Chemical Sciences, Office of Basic Energy Sciences.
Author Institution: Department of Chemistry, brookhaven National Laboratory
Author Institution: Department of Chemistry, brookhaven National Laboratory