Measurements of Ultralow Partial Pressures of Cesium by the Method of Laser Spectroscopy

摘要

Partial pressures of cesium from photocathodes of the PMT type in a vacuum (10~(-9) torr) are measured experimentally by the method of laser three-step photoionization. The magnitude of the photoionic signal ～5 mV corresponds to a pressure of cesium ～10~(-15) torr.