caa a22 4500 475760794 CHVBK 20180406123550.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1007/BF02495475 doi (NATIONALLICENCE)springer-10.1007/BF02495475 Nikitenko S. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut Isotope effect in the formation of hydrogen peroxide by the sonolysis of light and heavy water [Elektronische Daten] [S. Nikitenko] The kinetics of the formation of hydrogen peroxide by the sonolysis of light and heavy water in argon and oxygen atmospheres was investigated. The sonochemical reaction has a zero order with respect to hydrogen peroxide (H2O2, D2O2, or DHO2). The measurement of the kinetic isotope effect (α), defined as the ratio of the reaction rates in H2O and D2O, carried out under argon gave a value of 2.2±0.3. The observed isotope effect decreases with an increase in the concentration of light water in H2O−D2O mixtures. No isotope effect is displayed in the oxygen atmosphere (α=1.05±0.10). The isotope effect is determined presumably by the mechanism of sonochemical decomposition of water molecules, which includes the H2O−Ar* and D2O−Ar* energy exchange (where Ar* are argon atoms in the3P2.0 excited state) in the nonequilibrium plasma generated by a shock wave, arising upon a cavitation collapse. Kluwer Academic/Plenum Publishers, 2000 ultrasound nationallicence isotope effects nationallicence heavy water nationallicence Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/4(2000-04-01), 649-653 1066-5285 49:4<649 2000 49 11172 https://doi.org/10.1007/BF02495475 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02495475 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Nikitenko S. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/4(2000-04-01), 649-653 1066-5285 49:4<649 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer