Abstract
Details of the construction of a high resolution UV photoelectron spectrometer are presented. As analyser an electrostatic spherical condenser with a mean radius of r0=109.56 mm and a deflection angle of 161.7 degrees was chosen. The base pressure of the vacuum system is 10 nPa. Control of the analyser and data acquisition is performed by means of a computer based CAMAC system. A simple bakeable gas discharge source for rare gas resonance radiation is described. The spectrometer can be used for investigations of clean surfaces and of gases. Electron energies of less than 1 eV can be distinguished directly. During investigations of solids the photoelectrons are emitted into a field free region immediately after excitation. Thus the spectrometer is especially suitable for studies of single crystal faces and directional photoemission. The energy resolution obtained when measuring solids is demonstrated by photoemission spectra of an evaporated Au film and of an Ag single crystal. The width of the Fermi edge of Au is appreciably smaller than that previously obtained. Using Ne-resonance radiation (h(cross) omega =16.85 eV) the FWHM of the Ar+ 2P3/2 line was found to be 13 meV.