Infrared photoelectron emission from Scandate dispenser cathodes

Jensen, Kevin L.; Feldman, Donald W.; Virgo, Matt; O'Shea, Patrick G.
August 2003
Applied Physics Letters;8/11/2003, Vol. 83 Issue 6, p1269
Academic Journal
Nonlinear photoelectric emission from Scandate dispenser cathodes using 1.064-μm radiation in nanosecond-scale pulses has been observed. Unlike single-photon emission, the photocurrent is a strong function of both the initial lattice temperature and the applied electric field as well as laser intensity. The parametric data is compared to a theoretical model for the process, and the data is shown to be explicable in terms of laser heating of the electron gas and subsequent photoemission. © 2003 American Institute of Physics.


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