Investigation of Linear Beam and New Concepts of Microwave Power Generation. Part I. Theoretical and Experimental Considerations of the Double-Quantum Photoelectric Effect. Part II. Gain Expressions for Beam-Plasma Interaction

摘要

A detailed analysis of the magnitude and time dependence of double-quantum photoelectric currents from metals irradiated by a modulation laser beam is carried out. It is noted that not all terms in the perturbation Hamiltonian contribute to the photoelectric current. Current densities for different metals with various Fermi levels and work functions are calculated and it is shown that these currents should be large enough to be measured. Thermionic emission is also considered from a theoretical point of view. The surface temperature of a metal is derived as a function of time and light intensity for a modulated light beam and for a single pulse of light. From these results it is possible to estimate the thermionic emission due to an unfocused ruby laser beam and due to a focused gas laser beam. It is shown that for the case of a focused ruby laser the model used in calculating the surface temperature is probably no longer valid. (Author)