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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
Published on: June 19, 2018
Deflection gating for time-resolved x-ray magnetic circular dichroism-photoemission electron microscopy using
C Wiemann1, A M Kaiser, S Cramm
1Peter Grünberg Institut PGI-6 Electronic Properties, Research Centre Jülich, D-52425 Jülich, Germany.
The Review of Scientific Instruments
|July 5, 2012
Summary
A new gating technique for time-resolving photoemission microscopy enables picosecond measurements. This method uses electrostatic deflection for fast switching, significantly improving dark current rejection and data acquisition.
Area of Science:
- Physics
- Materials Science
- Surface Science
Background:
- Time-resolving photoemission microscopy is crucial for studying dynamic processes.
- Existing techniques face limitations in temporal resolution and signal-to-noise ratio.
- Synchrotron radiation sources offer pulsed electron beams ideal for time-resolved studies.
Purpose of the Study:
- To develop and present a novel gating technique for time-resolving photoemission microscopy.
- To achieve high temporal resolution (picosecond regime) in photoemission measurements.
- To enhance dark current rejection for improved signal quality.
Main Methods:
- Implementation of an electrostatic deflector in the electron optical system.
- Fast switching between imaging and blocked electron-optical paths using an aperture stop.
- Utilizing the time structure of the BESSY II synchrotron radiation source.
Main Results:
- Demonstration of a gating technique with a switching time of 20 ns.
- Achieved superior dark current rejection compared to conventional methods.
- Successful application for time-resolved measurements in the picosecond regime.
Conclusions:
- The developed gating technique significantly advances time-resolving photoemission microscopy.
- This method enables precise picosecond-resolved studies of dynamic phenomena.
- The technique is well-suited for utilizing pulsed synchrotron radiation sources like BESSY II.
