Unified Data Sheet

P64 - X-Ray Absorption Spectroscopy

P64 is dedicated to X-Ray Absorption Spectroscopy experiments, which require high flux, like QEXAFS in the sub-second timescale, EXAFS on highly-diluted systems, and to high-resolution resonant x-ray emission spectroscopy. The energy range covers 4-45keV.

CONTACT


GENERAL SPECIFICATIONS

techniques available

EXAFS, QEXAFS, RXES
photon source
undulator
period
number of periods
max power

32.8 mm
       58
source brilliance 
10 18 ph /s / 0.1% bw / mA    (max. 100mA)
polarization available
linear horizontal
energy range 


       4 keV - 44 keV
beamline energy resolution


       ΔE/E = 1.4 x 10-4 resp. 0.3 x 10-4
max flux ON SAMPLE

1x1013 ph/s at 8.9 keV
(calculated, tuned undulator)
1x1012 ph/s at 8.9 keV
(calculated, tapered undulator)
spot size ON SAMPLE 

150 μm x 50 μm
2 mm x 1 mm
sample type


       any

 

OPTICS

type

liq. N2 cooled Double Crystal Monochromator
available reflections
Si111  and  Si311
energy range         
4.9 keV - 44 keV
resolving power 

E/ ΔE : 1x104 ... 3x104

type

 Oscillating Channel-Cut Monochromator (QEXAFS)
available reflections
Si111
energy range         
 5.5keV - 24 keV
resolving power 

E/ ΔE : 7x103

type


       Mirror 1 and 2

Coating

Silicon
Platinum
Rhodium

Energy Range

4-25keV

Usage

Harmonic rejection (4-10keV, 9keV-20keV, 14-25keV)
focussing (4-20keV)


        



       ENDSTATION


EXAFS, QEXAFS

Experimental Table

Breadboard with X95 rail

Beam height over rail 

28cm
Sample environment 

Vacuum sample cross with standard motorized sample holder for 5 samples
Closed cycle cryostat with sample cell and He exchange gas, T range 4K - 290K, LakeShore temperature controller, motorized sample holder for 4 samples, sample load lock
sufficient space for user equipment
RXES

Experimental Table

Breadboard

Beam height

50cm

Sample
environment 

Vacuum
user-defined equipment

DETECTOR(S)

Detection modes
Transmission 

yes
Refraction   

no
Fluorescence           

yes
Total electron yield

no
Grazing incidence angle    

yes


Point Detector(s)
Type 


        Ion Chambers
energy resolution 
 none
count rate 


       linear up to 1013 cts/s  


       Beam Size   


       given by slits


         typical collection time


       50ms to 300s per EXAFS scan
Fluorescence Detector
Type 
Canberra 100 element 
energy resolution 

250 eV at 5.6keV 
count rate 


       105 Hz per element 

2theta range  


       fixed at 90°
  typical collection time

0.1s - 5s

 

CONTROL/DATA ANALYSIS

Software type


       Spok, Tango, Taurus
Data output type


       spectra, parameters such as temp., press, etc.
Data output


       ASCII, HDF5, NEXUS
Software(s) for quantitative analysis


       Athena, Artemis, FEFF


        



       SUPPORT LAB



       A sample preparation lab with a hood and a glove box is adjacent to the control hutch.A pellet press, a balance, a heating-plate with a magnetic stirrer, and an ultrasonic bath are available.




       Please contact beamline staff for specific question, if you plan to use it, or if you require additional equipment.