The BLOCH beamline consists of two branchlines, and is dedicated to high resolution photoelectron spectroscopy, encompassing angle-resolved (ARPES), spin resolved (spin-ARPES) and core-level spectroscopy. Located on the 1.5 GeV storage ring, it employs an elliptically polarising undulator as a photon source. Equipped with both gas and solid state filters for minimising higher order light contamination, the BLOCH beamline offers photon energies with controllable polarization spanning UV to soft X-ray (10-1000eV). This range is carefully chosen to combine extremely high momentum and energy resolution for valence-band ARPES studies with the higher energies required for detailed core level spectroscopy.
Branchline 1 has an end station dedicated to high-performance ARPES experiments, ideal for mapping energy dispersions and Fermi surfaces. The end station consists of six ultra high vacuum chambers connected by a radial-distribution chamber. Besides the main analysis chamber there are two flexible and well equipped preparation chambers (dedicated to high- and low-vapour pressure evaporation sources), a scanning tunnelling microscope, a sample storage chamber and a fast-entry load-lock. The analysis chamber is equipped with a fully motorized six-axis manipulator capable of cooling samples to below 15K, paired with a high performance deflector based DA30 hemispherical analyser from SCIENTA-OMICRON. Deflection mode measurements enable Fermi surface mapping without needing to rotate the sample, advantageous for very small or inhomogeneous samples and also for maintaining a fixed polarization geometry.
Branchline 2 will be dedicated to spin-resolved ARPES measurements. Endstation is currently in the design phase.
Spokes Person: Roger Uhrberg (Linköping University)
Project Manager: Balasubramanian Thiagarajan (MAX IV Laboratory)
|Techniques||high resolution angle-resolved photoelectron spectroscopy (ARPES), optionally spin resolved (Spin-ARPES) and core-level spectroscopy (CLS)|
|Beam Size||10μm x 25μm (VxH)|
|Energy Range||10 -1000 eV|
|Samples||Research applications at this beamline cover a range of important topics in physics, including new materials, topological insulators, surface alloys, correlated systems, organic molecular layers, magnetic semiconductors, superconductors and other and cooperative phenomena.|