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Advanced detection systems for X-ray fluorescence excitation spectroscopy
J Goulon1, A Rogalev, G Goujon
1European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France. goulon@esrf.fr
Journal of Synchrotron Radiation
|December 24, 2004
Summary
Researchers developed advanced X-ray detectors for X-ray Absorption Spectroscopy. A new silicon drift-diode array achieved high-resolution X-ray fluorescence spectra for magnetic nanoparticles.
Area of Science:
- Materials Science
- Spectroscopy
- Detector Physics
Background:
- The ESRF X-ray Absorption Spectroscopy group has focused on detector advancements over 15 years.
- Development included photodiodes for integrated current detection.
- A key focus was a silicon drift-diode array for energy-dispersive X-ray fluorescence detection.
Purpose of the Study:
- To detail detector developments in X-ray Absorption Spectroscopy.
- To present the performance of a novel silicon drift-diode array.
- To showcase applications in analyzing magnetic nanoparticles.
Main Methods:
- Development of various photodiode types.
- Construction and implementation of a silicon drift-diode array.
- Utilizing a high-energy-resolution crystal analyzer on beamline ID12.
- Numerical deconvolution of spectra for enhanced resolution.
Main Results:
- The silicon drift-diode array is now operational.
- High-quality X-ray Magnetic Circular Dichroism (XMCD)/X-ray Absorption Fine Structure (XAFS) spectra were recorded for [Fe70Pt30] nanoparticles.
- Achieved energy resolutions of 82 eV (Si Kαβ), 126 eV (Fe Kα), and 176 eV (Pt Lα) after spectral deconvolution.
- Enabled photon-in/photon-out X-ray fluorescence excitation spectra acquisition.
Conclusions:
- The developed detectors, particularly the Si drift-diode array, are effective for high-resolution X-ray spectroscopy.
- The technology shows promise for analyzing magnetic materials and potentially biological samples.