RECOMBINATION AND DIFFUSION IN INJECTED ELECTRON-HOLE PLASMAS,
BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH
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The decay of injected plasmas, produced in p-InSb at 77 K, between 20 nsec and 5 microsec after the driving voltage is cut off is being studied in the absence and presence of magnetic fields. The purpose of the present investigation is to try to determine the loss mechanisms and then influence the plasma decay by various magnetic field configurations. What is presently known about the steady-state distribution before decay is allowed to begin is described first. Then it is shown that the properties of the early decay depend on initial density, but all decay becomes exponential in time after approximately 700 nsec. The fundamental mode of decay in which carriers everywhere in the sample are lost at the same rate is not established by 5 microsec. The preliminary results on decay of a plasma placed in an axial magnetic field show that the number of particles remaining after a given time, e.g., 50 nsec, is reduced as the field is raised from 0 to approximately 150 G and then, with a further slight increase in field strength, markedly enhanced. This enhancement extends over only a narrow interval of magnetic field. Sometimes oscillations in the number of surviving particles are observed as a function of magnetic field.
- Solid State Physics