High-resolution soft X-ray beamline ADRESS at the Swiss Light Source for resonant inelastic X-ray scattering and angle-resolved photoelectron spectroscopies

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138

作者：

VN Strocov，T Schmitt，U Flechsig，T Schmidt，L Patthey

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摘要：

The concepts and technical realisation of the high-resolution soft X-ray beamline ADRESS operating in the energy range from 300 to 1600eV and intended for resonant inelastic X-ray scattering (RIXS) and angle-resolved photoelectron spectroscopy (ARPES) are described. The photon source is an undulator of novel fixed-gap design where longitudinal movement of permanent magnetic arrays controls not only the light polarization (including circular and 0–180° rotatable linear polarizations) but also the energy without changing the gap. The beamline optics is based on the well established scheme of plane-grating monochromator operating in collimated light. The ultimate resolving power E/ΔE is above 33000 at 1keV photon energy. The choice of blazed versus lamellar gratings and optimization of their profile parameters is described. Owing to glancing angles on the mirrors as well as optimized groove densities and profiles of the gratings, the beamline is capable of delivering high photon flux up to 1 × 1013photons s1 (0.01% BW)1 at 1keV. Ellipsoidal refocusing optics used for the RIXS endstation demagnifies the vertical spot size down to 4m, which allows slitless operation and thus maximal transmission of the high-resolution RIXS spectrometer delivering E/ΔE > 11000 at 1keV photon energy. Apart from the beamline optics, an overview of the control system is given, the diagnostics and software tools are described, and strategies used for the optical alignment are discussed. An introduction to the concepts and instrumental realisation of the ARPES and RIXS endstations is given.

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关键词：

SWISS LIGHT SOURCE FIXED-GAP UNDULATOR SOFT X-RAY BEAMLINE X-RAY OPTICS PLANE-GRATING MONOCHROMATOR GRATING OPTIMIZATION ELLIPSOIDAL REFOCUSING OPTICS RESONANT INELASTIC X-RAY SCATTERING ANGLE-RESOLVED PHOTOELECTRON SPECTROSCOPY