Single-shot mega-electronvolt ultrafast electron diffraction for structure dynamic studies of warm dense matter

We have developed a single-shot mega-electronvolt ultrafast-electron-diffraction system to measure the structural dynamics of warm dense matter. The electron probe in this system is featured by a kinetic energy of 3.2 MeV and a total charge of 20 fC, with the FWHM pulse duration and spot size at sam...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.11D810-11D810
Main Authors: Mo, M. Z., Shen, X., Chen, Z., Li, R. K., Dunning, M., Sokolowski-Tinten, K., Zheng, Q., Weathersby, S. P., Reid, A. H., Coffee, R., Makasyuk, I., Edstrom, S., McCormick, D., Jobe, K., Hast, C., Glenzer, S. H., Wang, X.
Format: Article
Language:English
Subjects:
Bragg curve
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electron diffraction
Electron probes
electron scattering
Foils
Gold
Kinetic energy
Liquid phases
Phase transitions
Pulse duration
Scientific apparatus & instruments
Single crystals
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Summary:We have developed a single-shot mega-electronvolt ultrafast-electron-diffraction system to measure the structural dynamics of warm dense matter. The electron probe in this system is featured by a kinetic energy of 3.2 MeV and a total charge of 20 fC, with the FWHM pulse duration and spot size at sample of 350 fs and 120 μm respectively. We demonstrate its unique capability by visualizing the atomic structural changes of warm dense gold formed from a laser-excited 35-nm freestanding single-crystal gold foil. The temporal evolution of the Bragg peak intensity and of the liquid signal during solid-liquid phase transition are quantitatively determined. This experimental capability opens up an exciting opportunity to unravel the atomic dynamics of structural phase transitions in warm dense matter regime.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4960070