The validity of Ohm's law is examined for the case of electric fields which are changing either in amplitude or direction over distances comparable to one electron mean free path within a metal. By perturbing both the amplitude and spatial variation of the electric field, an approximate solution of Boltzmann's equation is obtained which yields a first-order correction to Ohm's law that is, in general, not in the same direction as the linear J = σE term. The nonlinear term is quadratic in the electric field amplitude and depends on the spatial derivatives of the electric field.

Low power transverse optical bistability near bound excitons in cadmium sulfide Appl. Phys. Lett. 44, 574 (1984); 10.1063/1.94844Stopping cross sections for 0.25-3.0MeV 4He ions in cadmium sulfide A new experimental technique has been used 'to measure the stopping power of CdS for He ions. This technique consists of measuring the energy spectrum of either He ions backscattered from implanted Bi or of a particles emitted by an implanted radioactive isotope, such as P02IO. A thin layer is then etched ofT the surface of the sample and the energy spectrum is measured again. The stopping power is calculated from these two spectra and the known thickness of the removed layer. These measurements and calculations have been made for energies ranging from 0.963 to 5.3 MeV with accuracies between 12% and 16%.

No abstract

No abstract

No abstract