THREE-PHOTON PHOTOELECTRIC EFFECT IN K3Sb

Abstract
Cubic response in photoelectric emission from K3Sb illuminated by a Nd‐glass laser was investigated. Comparison of energy distribution of emitted electrons under the laser irradiation and monochromatic irradiation of natural light (3000–3500 Å) showed that most of the photoelectrons excited by simultaneous absorption of three laser photons were changed in energy distribution by collision with valence electrons.