Excited states dynamics with x-rays at UE49-SGM
The endstation EDAX is dedicated to combined absorption and resonant inelastic x-ray scattering experiments on liquids in the soft x-ray range. The liquids are injected into the chamber via a liquid jet system. Gasses and also small amounts of liquids can be investigated using a liquid/gas flow cell. The MCP-based RIXS spectrometer has a resolving power better than 1000. The project is funded by the ERC Advanced Grant Project EDAX with the option for collaborative Research at BESSY II and FELs.Selected Applications:
- Occupied electronic structure investigations of molecules
- Investigations of bond character and strength with elemental selectivity
- Investigations of solute solvent interactions in liquid sample environments
- Detection of polarization anisotropies for investigations of molecular symmetry
- Dynamics in core-excited states
|Energy range||90 - 1400 eV|
|Energy resolution||4 000 - 12 000|
|Flux||Up to 4*1013 photons / s / 0.1A / 0.1%BW|
|Polarisation||Full polarization control|
|Focus size (hor. x vert.)||20 μm x 10 μm|
|Phone||+49 30 8062 14832|
|Temperature range||0 – 100 °C|
|Detector||MCP based RIXS spectrometer, photodiode for transmission experiments|
|Manipulators||XYZ-manipulator (CF63) with micrometer resolution|
|Sample holder compatibility||cylindrical liquid jet or sample cell for RIXS measurements, liquid flat-jet for transmission experiments (mid 2021)|
|Additional equipment||A laser system for picosecond transient X-ray absorption measurements is in the construction phase.
Samples can be recovered from an in-vacuum catcher system.
Online simulations of RIXS spectra for a large variety of systems for simulation-assisted data interpretation is possible.
For more details and current status of the experimental station contact the station scientist(s).
Endstation for time-resolved NEXAFS and steady-state RIXS measurements on liquid, gaseous and solid samples and for complementary use at FELs and at BESSY II. The dedicated BESSY II time structure will be utilized for picosecond time resolved NEXAFS measurements in the future. The RIXS spectrometer of the end station is a modified GRAZE IV (XES 350) with three gratings. These cover the range between 50 and 900 eV. The resolution amounts to approximately 40 meV at 50 eV and 0.7 eV at 900 eV. Liquid samples are prepared in vaccum as thin jets (diameter 5-30 µm). The jet is either caught and and the liquid is extracted from the experimental chamber or frozen in a liquid nitrogen cooled trap after passing the interaction region. To protect the beam line from the typical 10-3mbar range in the measurement chamber during liquid jet operation, three differential pumping stages are used. The MCP-based detector is protected by an X-ray transmissive yet vacuum-tight thin foil. Static and time resolved RIXS measurements at liquids and gasses as well as non-linear Processes are conducted with this experimental station at BESSY II and FELs i.e. LCLS and FLASH. The apparatus is open to collaborative Research at BESSY II and FELs.
A setup for resonant inelastic soft x-ray scattering on liquids at free electron laser light sources K . Kunnus et al. Review of scientific instruments 83 (12), 123109 (2012)