UV Photoemission from Metal Cathodes for Picosecond Power Switches.

摘要

Results are reported of photoemission studies using laser pulses of 10 ps duration and 4.66 eV photon energy on metal cathodes. These included thin wires, flat surfaces and an yttrium cathode with a grainy surface. The measurements of current density and quantum efficiency under low and high surface fields indicate that field assisted efficiencies exceeding 0.1% and current densities exceeding 10,000 A/(sq cm) are obtainable. The results are compared to the requirements of switch power applications. 24 refs., 13 figs., 1 tab.