The FlexPES (Flexible PhotoElectron Spectroscopy) beamline caters for the experimental needs of both Surface/Material Science and Low Density Matter user communities offering the possibility to perform a variety of photoemission and soft X-ray absorption experiments in the photon energy range 40 – 1500 eV. The two-branch configuration with double-striped toroidal refocusing mirrors ensures maximum flexibility – up to four endstations can be accommodated on the two branches of the beamline simultaneously, and each of these endstations can avail of different focusing conditions. The end stations offer a diverse range of experimental techniques, detectors and sample handling facilities and can be used with a variety of sample delivery systems.

Techniques (as available by Q1 2021)

Available forTechnique/facility description
General UsersBeamline: Linear horizontally polarized light from LPU, with energy range 40-1500 eV. Spot on sample both defocused (0.5-1.5 mm) and focused (from 50x15 um to 150x40 um in different end stations).
General UsersSurface- and Material Science (SMS) branch: High-resolution photoelectron spectroscopy (PES) on solid samples using DA30-L(W) analyzer and 4-axis manipulator; X-ray absorption spectroscopy (XAS or NEXAFS) using total electron yield, partial electron yield and partial fluorescence yield (SDD detector).
General UsersLow Density Matter (LDM) branch: High-resolution PES on LDM samples using R4000 analyzer with the following sample delivery systems (samples must be approved by chemical safety group):
- Liquid jet setup for e.g. aqueous solutions
- Molecular jet source (continuous beam) for experiments on cold beams of atomic and molecular gases
- Gas cell for PES experiments on atomic and molecular gases
- Magnetron-based source for metal particle beams

Commissioning expertsLow Density Matter (LDM) branch:
COLTRIMS/Multi-coincidence spectroscopy in expert commissioning mode (ICE end station); to be used with molecular jet/cluster source.

2021-11-29

Honeycomb borophene: myth or reality?

Scientists examined whether honeycomb boron can function as a structural analogue 2D material to graphene. Employing core-level X-ray spectroscopies, scanning tunneling microscopy, and DFT calculations, they analyzed the structure and electronic properties of honeycomb boron after its reaction with aluminum. They found that although it resembles graphene in electronic structure to some extent, it fails