On chemical reactions in the laser-induced breakdown of a liquid

Autor: O. B. Ovchinnikov, I. M. Margulis, M. A. Margulis
Rok vydání: 2006
Předmět:
Zdroj: Russian Journal of Physical Chemistry. 80:986-990
ISSN: 1531-863X
0036-0244
DOI: 10.1134/s0036024406060264
Popis: It is shown experimentally that a laser-induced breakdown of a liquid is accompanied by chemical reactions initiated by radicals and excited species formed in the spark. It is found that, in water, the laser-induced breakdown is accompanied by the dissociation of water and dissolved nitrogen molecules with the formation of HNO2 and HNO3, while, in a FeSO4 aqueous solution, by the Fe2+ → Fe3+ oxidation reaction. It is assumed that the mechanism of the process is analogous to that of the action of ionizing radiations and the chemical action of ultrasonically induced cavitation (it is proposed that this mechanism of chemical action of a laser-induced spark proposed be termed indirect). Energy yields of these reactions are found to be of the same order of magnitude as for sonochemical redox reactions. It is shown that the laser-induced breakdown of an aqueous solution of maleic acid is accompanied by its stereoisomerization into fumaric acid, a process catalyzed by small amounts of an alkyl bromide. It is established that, for the formation of fumaric acid in a laser-induced spark, the energy yield is about five orders of magnitude higher than that typical of the above-mentioned redox reactions in the laser-induced spark.
Databáze: OpenAIRE
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