Application of Vacuum Ultraviolet Laser Light to Photoelectron Spectroscopy

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Abstract
A photoelectron spectrometer based on laser light of vacuum ultraviolet (VUV) wavelength was developed for the study of electronic states of a solid surface. The VUV laser light, with 10.48 eV photon energy, generated by frequency tripling of the third harmonics of a pulsed YAG laser was used to induce photoelectron emission exhibiting a unique advantage over the conventional light source. The outstanding capabilities of this type of photoelectron spectrometer were demonstrated in (a) spatial resolution of at least 0.15 mm, (b) state selective photoemission by use of the polarized VUV laser, and (c) sensitivity to a normally unoccupied state by means of two-step excitation.