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Femtosecond mega-electron-volt electron microdiffraction
- Source :
- Ultramicroscopy. 184
- Publication Year :
- 2017
-
Abstract
- To understand and control the basic functions of physical, chemical and biological processes from micron to nano-meter scale, an instrument capable of visualizing transient structural changes of inhomogeneous materials with atomic spatial and temporal resolutions, is required. One such technique is femtosecond electron microdiffraction, in which a short electron pulse with femtosecond-scale duration is focused into a micron-scale spot and used to obtain diffraction images to resolve ultrafast structural dynamics over a localized crystalline domain. In this letter, we report the experimental demonstration of time-resolved mega-electron-volt electron microdiffraction which achieves a 5 μm root-mean-square (rms) beam size on the sample and a 110 fs rms temporal resolution. Using pulses of 10k electrons at 4.2 MeV energy with a normalized emittance 3 nm-rad, we obtained high quality diffraction from a single 10 μm paraffin ( C 44 H 90 ) crystal. The phonon softening mode in optical-pumped polycrystalline Bi was also time-resolved, demonstrating the temporal resolution limits of the instrument. This new characterization capability will open many research opportunities in material and biological sciences.
- Subjects :
- Diffraction
Materials science
business.industry
02 engineering and technology
Electron
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Characterization (materials science)
Crystal
Optics
Temporal resolution
0103 physical sciences
Femtosecond
Thermal emittance
010306 general physics
0210 nano-technology
business
Instrumentation
Ultrashort pulse
Subjects
Details
- ISSN :
- 18792723
- Volume :
- 184
- Database :
- OpenAIRE
- Journal :
- Ultramicroscopy
- Accession number :
- edsair.doi.dedup.....6ad5fda5bf96bbf28c6284dcf40d3239