PHOTON SCIENCE

P65 - EXAFS Beamline

P65 is dedicated to the majority of EXAFS experiments which do not require extremely high brilliance, photon flux or beamsizes below 1 mm². This includes most operando experiments on catalysts, material sciences and geo- and environmental chemistry. The energy range covers 4 keV - 44 keV.

CONTACT

Contact e-mail for all requests related to beamlines P65/P64 Edmund Welter Beamline Scientist in charge Sergiu Levcenco Beamline Scientist Tinku Dan Beamline Scientist

GENERAL SPECIFICATIONS

Techniques available	EXAFS, XANES
Photon source	11 periods undulator
Period Number of periods Max power	32.8 mm 11
Source brilliance	5x10 16 ph /s / 0.1% bw / mA    (max. 100mA)
Available polarisation	linear horizontal
Energy range	4 keV - 44 keV
Beamline energy resolution	deltaE/E = 1.4 x 10-4 resp. 0.6 x 10-4
Max flux ON SAMPLE	2x1012 ph/s at 8.9 keV (calculated, tuned undulator)
Spot size ON SAMPLE	0.5 x 1 mm2
Sample type	any

 

OPTICS

Type	Water cooled Double Crystal Monochromator
Energy range	4 keV - 44 keV
Resolving power	E/ΔE : 1x104 - 2x104
Available reflections	Si111 and Si311

Type	Mirror 1 and 2
Coating	Silicon Rhodium Platin
Energy Range	4-44 keV
Usage	Harmonic rejection (4 keV - 44 keV) Reduce power load density on 1st DCM crystal

        

       ENDSTATION

XAFS

Experimental Table	Breadboard with X95 rail
Beam height over rail	28cm
Sample environment	Vacuum sample cross with standard motorised sample holder for up to 20 samples He cryostat with sample cell and He exchange gas, T range 4K - 290K, motorized sample holder for 4 samples Space for user 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 1012 s-1
Beam Size	given by slits
Typical collection time	30 s - 300 s per EXAFS scan

Fluorescence Detector

Type	Hitachi ME4 SDD
Energy resolution	200 eV at 5.6keV
Count rate	2 * 105 s-1 per element
2θ range	fixed at 90°
Typical collection time per point	0.1 s - 5 s

 

CONTROL/DATA ANALYSIS

Software type	Sardana, Tango
Data output type	Spectra, parameters such as temp., press, etc.
Data output	ASCII, HDF5/NEXUS
Software(s) for quantitative analysis	Larch, Demeter, FEFF , Viper

        

       SUPPORT LAB

       A sample preparation lab equipped with a fume hood and a glove box is adjacent to the control hutch. An analytical balance and a hydraulic pellet press is available inside and outside the glove box.