Laser photolysis of C2H2 and CF3C2H at 193 nm: Production of C2(d3Πg and CH(A2Δ) and their quenching by Xe |
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Authors: | Hideo Okabe RJ Cody JE Allen |
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Institution: | NASA/Goddard Space Flight Center, Laboratory for Extraterrestrial Physics, Astrochemistry Branch, Greenbelt, Maryland 20771, USA |
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Abstract: | The 193 nm laser photodissociation of CH2H2 and CF3C2H has been studied. With the laser beam focused, C2(d3Πg) and CH(A2Δ) radicals were formed by multiphoton processes in both C2H2 and CF3C2H; however, the one-photon process forming C2H is still predominant in CF3C2H photolysis. The production of C2(d3Πg) and CH(A2Δ) emissions is prompt,and the emission intensities show similar (less than quadratic) dependence on laser power whether the radicals are produced from C2H2 or CF3C2H. In addition, the vibrational distribution of the Swan system is nearly the same in CF3C2H as in C2H2. The results indicate that the overall photolytic processes are similar in two molecules. Both the C2(d3Πg) and CH(A2Δ) emissions are quenched by Xe with rate constants of 4.8×10?11 and 1.8×10?11 cm3 molecule?1 s?1, respectively. |
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