PEAXIS

Combined RIXS and XPS

The station is currently under commissioning.

The PEAXIS (PhotoElectron Analysis and X-ray Inelastic Spectroscopy) is a fixed experimental station installed at the U41-PEAXIS beamline. It is dedicated to studies of angle-resolved RIXS (Resonant Inelastic X-ray Scattering) and PES (PhotoElectron Spectroscopy) on solids and liquid cells. As shown in the Schematic figure below, the station is equipped with an electron energy analyzer (violet) and a RIXS spectrometer (blue). Various sample manipulators (red) can be installed in the sample chamber (green) according to different sample environments. The RIXS spectrometer includes a grating chamber (dark blue), a five-meter RIXS arm (light blue) and a CCD detector (orange). The RIXS arm is continuously rotatable on a supporting rail in a range of 106.5 degrees.

Schematic of the PEAXIS station

Schematic of the PEAXIS station

Photo of the PEAXIS station

Photo of the PEAXIS station

RIXS spectra of liquid acetone vibrations detected at the excitation energy of 531 eV and various θ angles. The intense peaks at the channel 1000 come from the elastic scattering, and the rest, equally-spaced peaks represent the vibrational excited final states in the electronic ground state. The RIXS resolution (combined with the beamline) at 531 eV is about 60 meV.

RIXS spectra of liquid acetone vibrations detected at the excitation energy of 531 eV and various θ angles. The intense peaks at the channel 1000 come from the elastic scattering, and the rest, equally-spaced peaks represent the vibrational excited final states in the electronic ground state. The RIXS resolution (combined with the beamline) at 531 eV is about 60 meV.

List of publications
Station data
PEAXIS
Temperature range 20 ~ 1000 K
Pressure Range 10-8 ~ 10-9 mbar
Detector A hemispherical energy analyzer (SPECS PHOIBOS 150) for electron detections; a CCD camera (Andor iKon-L) for X-ray detections; two mass spectrometers for mass detections in the loadlock and sample chamber, respectively; an ammeter (Keithley 6514) for sample drain current measurements
Manipulators One liquid-cell manipulator with translational movements along XYZ axes and rotational movement around Z axis; two solid sample manipulators with full translational and rotational movements along XYZ axes covering two temperature ranges of 20 K ~ RT and LN ~ 1000 K
Sample holder compatibility less than 1 x 1 cm2
Beamline(s)

U41-PEAXIS

RIXS gratings Two VLS gratings of 2400 l/mm covering two energy ranges of 200 - 600 eV and 400 - 1200 eV
Sample treatment Ar sputtering and annealing

Methods

EXAFS, NEXAFS, Angular-resolved PES, XPS, RIXS

References:

  1. K. Lieutenant, T. Hofmann, C. Zendler, C. Schulz, E. F. Aziz and K. Habicht, Numerical optimization of a RIXS spectrometer using raytracing simulations, Journal of Physics: Conference Series (2016). DOI: 10.1088/1742-6596/738/1/012104
  2. K. Lieutenant, T. Hofmann, C. Schulz, M. Yablonskikh, K. Habicht, E. F. Aziz. Design Concept of the High-Resolution End-station PEAXIS at BESSY II: Wide-Q-Range RIXS and XPS Measurements on Solids, Solutions, and Interfaces. J. El. Spec. Rel. Phen. (2016). DOI: 10.1016/j.elspec.2015.08.009