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New PDF release: Advances in Electronics and Electron Physics, Vol. 57

By Claire Marton (Ed.)

ISBN-10: 0120146576

ISBN-13: 9780120146574

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The crucial quantity to measure for these processes in flames is the preexponential factor A. Kelly and Padley x [T(K)/2000] found, for example, that with Na, A is about 5 x cm3/sec. Generally, the preexponentials are about 5 x lo-' cm3/sec at 2000 K. 5 x lo-', for Na + H20,according to Kelly and Padley. These are as much as a 1000-fold greater than the cross sectionsfor gas-kinetic or excitation collisionswith the same species. Bates (1976) criticized Kelly and Padley's method of estimating rates and cross sections for individual species from data taken for the complex mixtures found in flames.

Thus, both polarization potentials and permanent dipoles can also give rise to resonances in electron scattering that one would call shape resonances. 7. Dissociative Attachment: Halogen and Hydrogen Halide Molecules The halogens, the hydrogen halides, and larger halogenated molecules play special roles in electron capture because of their large capture cross sections for electrons of low energy. Dissociation of X, e to X- + X is exothermic for all the halogens, as Tam and Wong point out (1978).

The kinetics are generally expressed in terms of an Arrhenius form k = A exp(EA/kT) (11) where, in flames, EA, the activation energy, is approximately the ionization potential; in shocks, the activation energy seems to be the first excitation energy (Johnston and Kornegay, 1963). The crucial quantity to measure for these processes in flames is the preexponential factor A. Kelly and Padley x [T(K)/2000] found, for example, that with Na, A is about 5 x cm3/sec. Generally, the preexponentials are about 5 x lo-' cm3/sec at 2000 K.

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Advances in Electronics and Electron Physics, Vol. 57 by Claire Marton (Ed.)


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