| Among the numerous photoemission (PES) spectrometers at BESSY I will focus on two: the high-kinetic-energy (HIKE) PES station and the "1^3" spectrometer for very high-resolution ARPES. The former operates on a bending magnet and the X-rays can be scanned in the range 1.7-12 KeV. The HIKE endstation is equipped with a Gammadata-Scienta R4000 analyser. High energy resolution (ΔE < 0.35 eV) can be achieved in bulk sensitive core-level spectroscopy. The potential of the instrumentation is illustrated by a recent temperature dependent study of a Ni/Cu interface and by measurements of satellites in the Ni1s excitation spectrum of Ni metal. The "1^3" ARPES spectrometer is operated at the undulator U125 using a monochromator which provides a high flux of photons in the energy range 4-100 eV with a very high energy resolution (ΔE < 1 meV). A similar resolution has been achieved by the Gammadata-Scienta R4000 analyser. A future He3 cryostat is expected to provide a sample temperature below 1K. First measurements on high-Tc superconductors, heavy fermion systems, CDW systems and intercalated graphite using a He4 cryostat (T > 4 K) will be presented. |
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