Isotope-selective IR multiphoton dissociation of CHClF2 in the presence of NO2 |
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| Authors: | M.M. Ivanenko H. Handreck J. Göthel W. Fuss K.-L. Kompa P. Hering |
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| Affiliation: | Institut für Lasermedizin, Universit?t Düsseldorf, P.O. Box 101007, D-40001 Düsseldorf, Germany (Fax: +49-211/31?26?31, E-mail: hering@uni-duesseldorf.de), DE
Max-Planck-Institut für Quantenoptik, P.O. Box 1513, D-85740 Garching, Germany, DE
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| Abstract: | 2 to the CHClF2/He mixture irradiated by a Q-switched CO2 laser leads to oxidation of the dissociation product according to the reaction: CF2+NO2→COF2+NO. The resulting COF2 with a 13C content near 50% is easy to convert to CO2 or CO for further enrichment by a nonlaser process. We measured the dependence of the fraction of dimerised CF2 on NO2 pressure pNO2 and the amount of NO2 required to suppress dimerisation on the dissociation yield. Both agree with a kinetic model using known rate constants. For the range of the dissociation parameters (13CF2 yield of 10% per pulse, isotope selectivity of 130) of practical interest, 95% of the CF2 produced is oxidized at pNO2≈1/2pCHClF2. In the absence of NO2, major (20%–35%) losses of CF2 at the metal walls of the irradiation system were observed. Addition of NO2 suppresses them. For comparison, we also used O2 as a scavenger in CHClF2 dissociation. NO2 is by orders of magnitude more efficient. Received: 21 January 1997/Revised version: 23 March 1997 |
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| Keywords: | PACS: 82.40Z 82.50 |
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