INFRARED SPECTRA OF THE MOLECULAR IONS AND RADICALS PRODUCED BY PROTON RADIOLYSIS AND ARGON RESONANCE PHOTOLYSIS OF THE FREON 11-14 SERIES DURING CONDENSATION AT $15^\circ K$
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Date
1976
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Ohio State University
Abstract
Samples of the Freon 11-14 series $(CF_{n}Cl_{4-n}, n 1-4)$ at high dilution in argon were deposited at 15$^\circ K$ during simultaneous 2.0 keV proton beam irradiation. And the products studied by infrared spectroscopy. Exceedingly large yields of the primary radicals $CCl_{3}, CFC1_{2}, CF_{2}Cl$ and $CF_{3}$ were formed in the various experiments ; in addition, several other absorptions were observed and have been assigned to a number of new molecular species. It is believed that some molecular ions were trapped in electrically neutral species of the type $CFC1^{+}_{2}Cl^{-}$ , while others were trapped as isolated ions; the isolated ions were readily destroyed by photobleaching and neutralization with thermal electrons from an exposed bulb filament. Samples of the Freon 11-14 series at high dilution in argon were also deposited and simultaneously photolyzed by argon resonance radiation from a microwave discharge. While the trihalomethyl radicals were principal products of the proton beam irradiation, these radicals were produced in very low yield by photolysis+ADs- instead, the electrically neutral ion-paired species were predominately formed. The spectra and structure of the products formed in those experiments will be discussed.
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Author Institution: Department of Chemistry, University of Virginia