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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
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
Under construction (planned for 2027)