Gas phase Radicals

GP 1] [R 13] So-called micro-strip electrodes (MSE) can act as electrically steerable catalysts when used to switch on and off the conversion of ammonia at moderate voltages, several hundred volts (6 vol.-% NHj, 88 vol.-% O2, balance He 0.51 ms 260-380 °C) [75]. Thereby, NO formation was observed. By emitting and accelerating electrons in the range of mA cm current density from the solid to the gas phase, radicals were formed, typically much more than the number of released electrons, e.g. 10 radicals per electron. This efficient use of energy is referred to as dynamic catalysis. The gas phase near the electrodes contains hot and cold radicals, thus providing a two-temperature system. [Pg.295]

Furthermore volatile SbX3 decomposes in the heat of the flame to generate fine particles of Sb203, which form sites for radical recombination. A problem with these gas-phase radical quenching agents is that the volatiles emitted are acidic and corrosive. [Pg.109]

Addition reactions, gas-phase radical directive effects in, 16, 51... [Pg.335]

Expressing the stability of these gas phase radicals in terms of approximate half-lives is not meant to imply a unimolecular decomposition of the radicals, nor even a strictly first order disappearance. [Pg.25]

Besides the mirror and addition reactions already discussed, gas phase radicals dimerize, disproportionate, transfer hydrogen, and polymerize olefins. Similar reactions in the liquid phase are an indication (but not proof) of free radical intermediates. [Pg.27]

THERM Thermodynamic Property Estimation for Radicals and Molecules, Edward R. Ritter and Joseph Bozzelli, Int. J. Chem. Kinet. 23, 767-778, (1991). A computer program for IBM PC and compatibles for estimating, editing, and entering thermodynamic property data for gas-phase radicals and molecules using Benson s group additivity method. [Pg.747]

Larmor frequency, 39 353, 42 127 Laser desorption, Pt(lOO), wave types, 37 257 Laser-induced fluorescence, in detection of surface-generated gas-phase radicals, 35 150-160... [Pg.133]

Many-body effects, 34 214-215 on deep core-level spectra of metals, 34 215 Many-body Hartree-Fock approach, 34 244 Mars-van Krevelen mechanism, 41 211 reaction, 32 120-121 Mass spectrometry, 30 302-304 of C-labeled hydrocarbons, 23 22-25 in detection of surface-generated gas-phase radicals, 35 142-148 apparatus, 35 145... [Pg.136]

UHV surface analysis, apparatus designs, 36 4-14 see also Ultrahigh vacuum surface analysis mechanisms, 32 313, 319-320 Modified Raney nickel catalyst defined, 32 215-217 hydrogenation, 32 224-229 Modifying technique of catalysts, 32 262-264 Modulated-beam mass spectrometry, in detection of surface-generated gas-phase radicals, 35 148-149 MojFe S CpjfCOlj, 38 352 Molar integral entropy of adsorption, 38 158, 160-161... [Pg.145]

Directive effects, in aromatic substitution, a quantitative treatment of, 1, 35 Directive effects, in gas-phase radical addition reactions, 16, 51 Discovery of mechanisms of enzyme action 1947-1963, 21, 1 Displacement reactions, gas-phase nucleophilic, 21, 197 Donor/acceptor organizations, 35, 193... [Pg.403]

Monks PS (2005) Gas-Phase Radical Chemistry in the Troposphere. Chem Soc Rev 34 376... [Pg.382]

Directive Effects in Gas-Phase Radical Additive Reactions... [Pg.39]

Tedder JM (1978) Directive Effects in Gas-Phase Radical Addition Reactions. In Gold V, Bethell D (eds) Adv Phys Org Chem, Academic Press, New-York 16 51... [Pg.225]

Absolute Arrhenius parameters for gas phase radical addition reactions... [Pg.73]

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