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Development of High-Energy-Resolution Display-Type Photoelectron Spectrometer in the Ultraviolet Photoelectron Spectroscopy Region

We have built a newly designed 2D-photoelectron spectroscopy (PES) analyzer for the measurement of wide-angle photoelectron angular distribution patterns in the ultraviolet photoelectron spectroscopy (UPS) region with no distortion. The spherical electric field inside the analyzer is achieved by the 158 tin obstacle rings placed on the inner surface of the machinable ceramic outer hemisphere. The inner surface of the outer hemisphere is covered with graphite powder to avoid charging. Hence, the ideal shape and the smooth change of the potential on the surface of the hemisphere could be realized. The energy resolution (ΔE/ EP) is estimated to be 0.43% (73 meV) at a kinetic energy of 16.85 eV and 0.16% at a kinetic energy of 300 eV.