The beamline is equipped with an endstation (GP endstation) for gas phase targets and samples with high vapour pressure, not suitable for UHV conditions (Figure). This endstation also accommodates a photoluminescence set-up. The endstation is portable. The vacuum vessel of the endstation will contain two parts, in the form of two measurement planes perpendicular to the direction of the beam. In the forward upstream plane, the main instrument will be the Scienta R4000 Electron Spectrometer that will be re-equipped with a position-sensitive fast detector for performing photoelectron-photoion coincidence measurements. The instrument can only be used for high resolution electron spectroscopy or in combination with detectors for other particles. A momentum imaging multi-hit-capable ion Time-of-Flight (TOF) spectrometer will be designed for particularly this purpose. The coincidence set-up will be controlled by tailored software.
The instrumentation required in photoluminescence experiments is placed at the back plane. The luminescence chamber will be equipped with a liquid helium cryostat and UV and/or secondary monochromators and detectors covering infrared, visible and ultraviolet spectral ranges. The luminescence set-up is intended for any type of luminescence spectroscopy, i.e. both steady state and time resolved emissions and excitation spectroscopy, as well as their temperature dependencies under ultraviolet and especially vacuum ultraviolet excitations. Imaging measurements are also being planned.
The downstream analysis chamber can be exchanged for a chamber that can be used to mount various user instruments.
The endstation will be designed to accommodate a variety of sample preparation systems, provided by the FinEstBeaMS consortium, as well as by external users. Initially, gas inlet systems and solid target vaporisation set-ups will be provided. GP endstation is presented below.