PETRA III at DESY
P64 Advanced X-Ray Absorption Spectroscopy
P64 is dedicated to X-ray absorption spectroscopy experiments, which require high flux. Among those are quick EXAFS (QEXAFS) on the 20-100ms time-scale, EXAFS of highly-diluted systems, e.g. bio-molecules with an active metallic center, and high-resolution spectroscopy with a dispersive fluorescence spectrometer in von-Hamos geometry. Other experiments, which require special set-ups and which profit from the high flux and small, focused beam, are also feasible and can be discussed with beamline staff.
Beamline P64 is located in the southern part of the PETRA III North Hall (P. P. Ewald Hall) close to the FLASH1 Hall.
X-ray absorption spectroscopy finds applications in various research fields:
- Physics: Mixed-valence compounds
- Chemistry: Catalysis
- Biology: Local environment of active metallic center
- Environmental sciences: Fate and state of metallic contaminations
- Arts: Composition and aging of paints
Beamline Energy Resolution
1.4 * 10-4 [eV] @ 9000 [eV]
Beamline Energy Range
4500 - 45000 [eV]
Max Flux On Sample
1 * 1013 [ph/s] @ 9000 [eV]
Spot Size On Sample Hor
150 - 2000 [um]
Spot Size On Sample Vert
50 - 800 [um]
Photon Sources
PETRAIII
Type
Undulator
Available Polarization
Linear horizontal
Source Spectral Brightness
1 * 1020 [ph/s/mrad^2/mm^2] @ 10000 [eV]
Deflection Parameter K
2.7
Energy Range
4000 - 60000 [eV]
Total Power
3.5 * 103 [W]
Number Of Periods
58
Period
32.8 [mm]
Note
Large overlap of 1st and 3rd harmonic in the range of 3d transition metals (Fe, Co, Ni, Cu EXAFS can be measured with 1st and 3rd harmonic).
Monochromators
Channel-Cut Monochromator
Energy Range
6.5 - 22 [keV]
Type
Channel-Cut Monochromator, fast oscillating for QEXAFS-measurements with 25ms-1s per EXAFS-scan (down to 10ms for XANES).
Resolving Power
1.4 * 10-4 [deltaE/E] @ 7000 [eV]
Number Of Gratings
1
Grating Type
Si(111)
The Si(311) reflection does not deliver sufficient flux for QEXAFS-measurements.
The Si(311) reflection does not deliver sufficient flux for QEXAFS-measurements.
Double-Crystal Monochromator
Energy Range
4 - 50 [keV]
Type
Double-crystal monochromator, fixed exit
Resolving Power
1.4 * 10-4 [deltaE/E] @ 7000 [eV]
Number Of Gratings
2
Grating Type
Si(111) and Si(311)
Other Optics
Mirrors
Description
Two separate mirrors for reduction of higher harmonics, and focusing, if required.
Three different coatings for different energy ranges: Si, up to 10keV; Rh, up to 22keV; Pt, up to 35keV (depending on angle)
Two cylinders on first mirror for horizontal focusing (one coated with Si, the other one with Rh), second mirror bendable for vertical focusing.
Vertical deflection of both mirrors.
Three different coatings for different energy ranges: Si, up to 10keV; Rh, up to 22keV; Pt, up to 35keV (depending on angle)
Two cylinders on first mirror for horizontal focusing (one coated with Si, the other one with Rh), second mirror bendable for vertical focusing.
Vertical deflection of both mirrors.
Techniques
Absorption
- EXAFS
- NEXAFS
Disciplines
Chemistry
- Biochemistry
- Catalysis
- Electrochemistry
Earth Sciences & Environment
- Geology
- Mineralogy
- Natural disaster, Desertification & Pollution
Life Sciences & Biotech
- Biophysics
- Protein and macromolecular structures
Material Sciences
- Metallurgy
Physics
- Hard condensed matter - electronic properties
- Hard condensed matter - structures
- Surfaces, interfaces and thin films
control/Data analysis
Control Software Type
- Sardana, Taurus, Spock, Python
Data Output Type
- Spectra, including parameter like temperature
Data Output Format
- ASCII, HDF5
Softwares For Data Analysis
- Athena, Viper, Artemis
