The Time Element in Photoelectric Emission

摘要

A measurement of the photoelectric response of transmission-type cesium-antimonide photocathodes to light pulses of 170 micromicrosecond duration is obtained by modulating the light from a xenon flash tube, type JFX12, with a specially designed Kerr cell shutter driven by pulsed 3 kmc/s microwave power. The degree of modulation of the photo¬electric emission produced in a type 1P42 phototube by the modulated light is obtained by using the photoelectron current to generate micro¬wave power in a resonant cavity whose output can be measured.nThe Kerr cell used is part of a resonant system,the Kerr cavity, in which very high electrostatic and microwave fields, approaching 10 volts per meter, are superimposed. The Kerr cell liquid is carbon-disulphide.