Field-Enhanced Secondary-Electron Emission from Polar Crystals

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Abstract
A calculation is given of the effect of an electric field on the migration to the surface of secondary electrons produced in polar crystals. As in a previous paper, the scattering with the optical polar modes is accounted for by an approximate treatment of the Boltzmann transport equation. The effect of the field on the secondary emission coefficient is obtained from a perturbation treatment and evaluated for a planar source and a ``constant loss'' production function. The results are compared with experimental data on MgO and agree as to order of magnitude.