Practice of Kinetics (Comprehensive Chemical Kinetics, Volume 1)

4 ANALYSIS 91GasinletElectric discharge(RF or microwave)Signal to consoleand recordersWaveguide assembly1Silica reactionCavityglass needle valve--Metal BlOJoint ,,/BlOjoint 1,Pumpsvalvesneedie Magnet-;manometerOil manometerMcLeodgauge -.-.- Moveable trolleyFig. 62. Flow system with moveable cavity at room temperature. From ref. 299.Fig. 63. Flow system with a fixed cavity at elevated temperatures. From ref. 300.4.4.3 Electron spin resonanceCarrington and Levy297 and Westenberg and de Haa~~~* have reviewed theearly work on gas-phase reactions in this field. The apparatus involves a fast-flowsystem where a gas, at a relatively low pressure is passed through a microwavedischarge to the resonance cavity of the spectrometer. At room temperature, it ispossible to have the cavity in variable positions299 but at higher temperatures itis fixed3'' (Figs. 62 and 63, respectively). The rate coefficients found for reactions(571460)0 +NO2 +NO +020 +NO +NO,+hvN +NO +N2 +O2H+H2 +2HzReferences pp. 104-1 I I