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XAFS and X-MCD spectroscopies with undulator gap scan
1European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble CEDEX, France.
Journal of Synchrotron Radiation
|July 21, 2004
Summary
The novel undulator gap-scan technique enhances X-ray absorption spectroscopy by maximizing photon statistics. This method improves Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Magnetic Circular Dichroism (X-MCD) studies.
Area of Science:
- Spectroscopy
- Synchrotron Radiation Physics
Background:
- X-ray absorption spectroscopy (XAS) is a powerful technique for material analysis.
- Optimizing photon statistics is crucial for high-quality XAS data.
Purpose of the Study:
- To report the first experimental applications of the undulator gap-scan technique in XAS.
- To demonstrate the advantages of this new method for EXAFS and X-MCD.
Main Methods:
- Utilizing an undulator gap-scan technique during XAS measurements.
- Maintaining the undulator at its peak emission for maximal photon flux.
Main Results:
- The undulator gap-scan technique maximizes photon statistics during EXAFS scans.
- Constant polarization rates are achievable over broad energy ranges for X-MCD studies using helical undulators.
Conclusions:
- The undulator gap-scan technique offers significant advantages for XAS, particularly EXAFS and X-MCD.
- This method enhances data quality by improving photon statistics and polarization stability.