A SPECTROMETER ARRANGEMENT FOR HIGH-RESOLUTION ANGLE-RESOLVED UV-PHOTOEMISSION USING LINEAR-POLARIZED LABORATORY PHOTON SOURCES

We have designed and tested the combination of a high-resolution elect ron energy analyzer with two differently linear-polarized rare-gas dis charge photon sources, which allow the experimental variation of the t hree spatial components of the exciting vector potential over a suffic iently wide range of light incidence angles. The whole spectrometer is intended to study the combined effects of surface optical properties and (squared) photoemission matrix elements. The final goal of our wor k is to extract reliable photoemission peak intensities from electron energy distribution curves and to compare them to calculated dipole st rengths. Our first test results demonstrate the possibility to obtain excellent energy resolution (Delta E less than or equal to 10 meV), an gle-resolution (Delta theta less than or equal to 0.4 degrees) and suf ficient electron countrates (0.1-10 kHz) of photoelectrons emitted by 93% linear-polarized light at a photon energy of h omega = 21.2 eV. (C ) 1998 Elsevier Science B.V. All rights reserved.