FinEstBeAMS is a materials and atmospheric science beamline at the MAX IV 1.5 GeV storage ring. It provides ultraviolet and soft X-ray radiation with precisely controlled and widely variable parameters. The beamline has two branches: one branch is dedicated to ultra-high vacuum studies of surfaces and interfaces and the other to gas-phase experiments and photoluminescence in solids. The range of research extends from the electronic structure studies of free particles (atoms, molecules, clusters and atmospheric particles) in gas phase and on surfaces to formation analysis and nanoscale characterisation of surfaces and interfaces. The design of the beamline facilitates sample transfer between the end stations, offering synergy between gas phase and solid-state research.
An Estonian and Finnish consortium, supported by the EU through the European Regional Development Fund and the Academy of Finland, has provided funding for the construction of the beamline, instrumentation and staff.
FinEstBeAMS in action
|Available for||Technique description|
|General Users||High-resolution photoelectron and Auger electron spectroscopy of gaseous samples. (GPES)|
|General Users||Ion time-of-flight mass spectrometry of gaseous samples. (GPES)|
|General Users||X-Ray Absorption of gaseous samples, measured in the Total Ion Yield mode. (GPES)|
|General Users||Photoelectron-photoion coincidence (PEPICO) spectroscopy of gaseous samples. (GPES)|
|General Users||Negative-ion/positive-ion coincidence (NIPICO) spectroscopy of gaseous samples. (GPES)|
|General Users||Measurement of photoluminescence emission spectra at fixed excitation energies in the wavelength range 200 - 1350 nm. (PLES)|
|General Users||Measurement of photoluminescence excitation spectra at fixed emission wavelengths in photon energy range 4.55 - 1300 eV. (PLES)|
|General Users||Time-resolved photoluminescence spectroscopy. (PLES)|
|General Users||Temperature dependencies of luminescence properties of solid materials in the temperature range from 10 to 350 K. (PLES)|
|General Users||Near edge X-ray absorption fine structure (NEXAFS), measurement temperature from 100 K (LN2 cooling) to 600 K (resistive heating) (SSES)|
|General Users||X-ray/UV photoelectron spectroscopy (XPS/UPS), measurement temperature from 100 K (LN2 cooling) to 600 K (resistive heating) (SSES)|
|General Users||Angle resolved photoelectron spectroscopy (ARPES), measurement temperature from 100 K (LN2 cooling) to 600 K (resistive heating) (SSES)|
The available photon energy range is 4.55-1300 eV using horizontally linear polarized radiation and 21-630 eV using vertically linear polarized radiation. However, the upper energy limit depends on the photon flux requirements of a given experiment. Circular polarization can be used in energy range 21-200 eV with some limitations. Please, contact the beamline staff for the details of using the circular polarization.
GPES = Gas-phase end station
PLES = Photoluminescence end station
SSES = Solid-state end station
A better detector for medical imaging technologies
Measuring the coincidence time resolution of the detectors in a TOF-PET test setup at CERN laboratory in Switzerland. Credit: Stefan Gundacker An international collaboration led by CERN, European Organization for Nuclear Research, studied the efficiency of next-generation silicon photomultipliers (SiPMs) using barium fluoride crystals when excited with X-ray and gamma photons. Their findings on scintillation