Field enhancement of the photoelectric and secondary electron emission from CsI
- 1 March 1995
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 77 (5) , 2138-2145
- https://doi.org/10.1063/1.358791
Abstract
We have measured the electron emission from a CsI-coated multiwire cathode, induced by ultraviolet photons and electrons, in vacuum at high electric fields. We found an enhancement in quantum efficiency of a factor of 1.5 at 160 nm, 3 at 185 nm, and 25 above 200 nm, at a field of 500 kV/cm. At the short wavelengths the amplitude of the effect is a linear function of the square root of the field strength. The enhancement of the electron-induced secondary electron emission yield is dependent on the primary electron energy: for energies above 1 keV it varies by a factor of 2 to 10. A simple model of the field enhancement of the photoemission is suggested. Practical applications are discussed.This publication has 23 references indexed in Scilit:
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