HIGH-RESOLUTION PHOTON DETECTION SYSTEM FOR INVERSE-PHOTOEMISSION SPECTROSCOPY

A new type of photon detection system has been developed for inverse-p hotoemission spectrometry. The photon detection system is made up of M gF2 prisms, two parabolic mirrors and a photon detector, and has a wid e solid acceptance angle of 0.35 sr. The energy resolution has been de termined to be as high as 94 meV by measuring a line spectrum (Xe I; 9 .569 eV) using this detection system. The overall energy resolution of the inverse-photoemission spectrometer consisting of the present phot on detection system and of an electron gun with a BaO cathode has been estimated to be 0.30 eV using data collected from polycrystalline Au. (C) 1998 Elsevier Science B.V.