PHELIX is a beamline operating in the soft X-ray range, the source of which is an elliptically polarizing undulator. Owing to the use of such a source, the beamline produces both linear and circular or elliptical polarizations of high intensity light. The light parameters of the PHELIX beamline and the equipment available at the end-station allow for spectroscopic measurements of photoelectrons and absorption in ultra-high vacuum conditions.
The available energy range of radiation (50 - 1500 eV) is suitable for research on many materials used e.g. in modern electronic devices, modern catalysts or fuel cells. The end-station enables measurements of Resonant Photoemission (Res-PES), Circular Dichroism (CD), X-ray Absorption Spectroscopy (XAS) in the Total Fluorescence Yield (TFY) mode and measurement of the sample current (Total Electron Yield - TEY). However, what makes the end-station unique is the ability to map the band structure in three dimensional k space using the Soft X-ray Angle Resolved Photoelectron Spectroscopy (SX-ARPES) and obtaining direct information about the spin texture using the 3D spin detector integrated with a photoelectron spectrometer (Spin Resolved Angle Resolved Photoelectron Spectroscopy - SR-ARPES).
Beamline parameters
| Parameters | Value |
|---|---|
| Source | Elliptically polarizing undulator EPU APPLE II type |
| Available energy range | 50–2000 eV for horizontal polarization 50–1500 eV for vertical polarization 50–350 eV for circular polarization (100%) 50-1035 eV for elliptical (50%) |
| Energy resolution ΔE/E | 1x10-4 |
Beam size at sample (H x V) |
60 x 160 µm2 |
| Photon flux at sample | ~1012 ph/s |
| Polarization | Linear (horizontal, vertical), circular, elliptical |
End station PHELIX – PES/XAS |
Currently available: Research techniques: XAS (TEY, TFY), ARPES, XPS, ResPES Temperature conditions: 500 – 20 K LHe cooling is possible for a maximum of approximately 2.5 measurement days during the beamtime (max 100 L per experiment). Under development (only available in the Expert Mode): Research techniques: SpinResolved-ARPES |
| End station PHELIX—NAP-XPS |
Under construction (planned for 2027) |