XES, XAS, RIXS, micro-jet station
LiXEdrom experimental station is equipped with a liquid micro-jet and a soft X-ray emission spectrometer and offer investigation with XAS and RIXS techniques of functional materials in solution.
The liquid solution is pumped into the experimental chamber through a circular glass capillary of 15-25 µm diameters at a flow rate of 0.35 - 1.5 ml/min and flow speed of around 40 m/s. The continuous freshly introduced solution enables experiments on samples free of synchrotron radiation damage which is a crucial prerequisite for investigating soft matter and biological systems. To preserve the ultra-high vacuum conditions required for soft X-ray experiments the LiXEdrom station is equipped with multi-stage pumping and liquid nitrogen cryo-traps that reduce the effective pressure by several orders of magnitude. Operating pressure in the main chamber is low 10-5 mbar, while at the connection to the beamline a pressure of 5·10-9 mbar is realized by the implementation of several pin-holes that reduce the high pressure flow toward the beamline section.
The X-ray spectrometer operates at grazing incidence angles and Rowland circle geometry. It is equipped with four gratings that cover the whole soft X-ray energy range from 30 eV to 1200 eV. To increase further the energy resolution, the spectrometer is operated at higher (2nd and 3rd) diffraction orders.
The detector consists of a stack of micro-channel plates (MCP), a phosphorous screen, and a charge coupled device (CCD). The MCP plates have a very small pore size of 5 µm and a small bias angle in order to increase spatial/energy resolution and detection efficiency at the CCD. They are coated with a thin film of cesium iodide to increase the number of secondary electrons and to enhance the overall detection efficiency. The CCD itself consists of an array of 1040 x 1392 pixels with a pixel size of 4.4 µm in order to match the resolving power of the grating with the spatial resolution of the CCD.
|Experiment in vacuum||yes|
|Detector||CCD camera coupled with MCP stack and Fluorescence Screen|
|Manipulators||high precision CF 63 manipulator|