Resonant Inelastic X-ray Scattering End Station

RIXS Spectrometer

A new high resolution soft X-ray RIXS spectrometer has been installed reaching a combined resolving power E/ΔE = 30000. The spectrometer features an 11m long scattering arm capable of rotating over 100º without breaking vacuum, and a full in-vacuum 4-circle sample goniometer. The instrument was designed and developed in collaboration with Giacomo Ghiringhelli & Lucio Braicovich from Politecnico di Milano.

The spectrometer saw its first user experiments in the summer of 2015 and is acheiving its target figures.

Routinely, < 60mV resolution is achieved at Cu L3 edges, with < 35mV in high resolution mode demonstrated in first commissioning.

A liquid helium flow cryostat can provide temperatures down to 20K at the sample with all degrees of freedom preserved.

The 11m long scattering arm can rotate over 100º, from a scattering angle of 50º through to 150º, without breaking ultra-high vacuum. Samples can also be transferred in vacuum

The entrance slit is focused by the VLS grating (800lines/mm or 1600 lines/mm) onto the exit slit. A cylindrical sagital refocusing mirror and an elliptical bender are used for horizontal and vertical focusing onto the sample position respectively. The beam size for the RIXS branch is 4 x 60 µm2 (FWHM). 

rixs preview.jpg

 

Goniometer

goniometer 2016.png

A full 4-circle in vacuum goniometer is used to manipulate the samples in the beam

For more information on the goniometer please visit its page here

 

 

 

Sample holders

Sample plates

Samples are fixed on sample plates which are then mounted on custom-made sample holders and transferred in UHV to the goniometer. Our standard sample plates have the shape of 13 mm wide hexagons with a flat top (see image below). Sample plates with other, custom shapes could be used if required by the experiment. This should be discussed with the beamline staff. Detailed drawings of the standard sample plates in pdf format can be found here.

sample_holders_rixs_drawing.png

Sample Holder Shuttle

Pictures demonstrate how sample plate inserts (small screws on top left and right diagonals fix the plate in. Orientation of hexagonal plate is freely chosen).

The plates are designed for a sample of 0.5 mm thickness - i.e. the nominal centre of rotation is 0.5 mm above the surface of the hexagonal piece. The goniometer can also move the sample ± 6 mm in this direction, however.

rixs_holder_with_hole.JPG   P1040419.JPG   P1040432.JPG

Sample Holder Shuttle Drawings

Below is a set of drawings in case you wish to replicate the shuttle. Note that there are 8 electrical connections possible using the pins shown in the figures, of which 6 can be used by the user.

RIXS_shuttle_drawing_1.PNG RIXS_shuttle_drawing_2.PNG RIXS_shuttle_drawing_3.PNG 

                      RIXS_shuttle_drawing_4.PNG                RIXS_shuttle_drawing_5.PNG

 

 

Data Analysis

Our software for the analysis of ID32 RIXS data is available here:

https://github.com/kkummer/RixsToolBox/releases

 

 

For more information please contact the beamline staff