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16 December 1988 Bright Photoelectron Beams Emitted From Excimer-Laser Illuminated LaB6
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Proceedings Volume 0998, Excimer Beam Applications; (1988)
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States
Lanthanum hexaboride has traditionally been used as a high-temperature thermionic emitter of electrons. This material, whose work function for a sintered multicrystalline composition is nominally 2.6 eV, appears to be a reasonably good photoemitter when irradiated by UV light. A quantum efficiency of 10-3 was recorded for photoemission at a 193 nm (ArF) incident wavelength. At least 20 A/cm2 were observed at 193 nm, 248 nm (KrF) and 308 (XeC1). Beam brightness appears to be a minimum of 4 x 105 A/cm2-rad2 at 248 nm.
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Peter E. Oettinger "Bright Photoelectron Beams Emitted From Excimer-Laser Illuminated LaB6", Proc. SPIE 0998, Excimer Beam Applications, (16 December 1988);


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