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Title: Femtosecond mega-electron-volt electron microdiffraction

Journal Article · · Ultramicroscopy

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 (C44H90) crystal. The phonon softening mode in optical-pumped polycrystalline Bi was also time-resolved, demonstrating the temporal resolution limits of the instrument. In conclusion, this new characterization capability will open many research opportunities in material and biological sciences.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1416370
Alternate ID(s):
OSTI ID: 1549779
Journal Information:
Ultramicroscopy, Vol. 184, Issue PA; ISSN 0304-3991
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (13)

Dynamical Slowing-Down in an Ultrafast Photoinduced Phase Transition journal August 2019
Ultrafast manipulation of mirror domain walls in a charge density wave journal October 2018
Relativistic Ultrafast Electron Microscopy: Single-Shot Diffraction Imaging with Femtosecond Electron Pulses journal May 2019
An ultrafast symmetry switch in a Weyl semimetal journal January 2019
Determination of the electron-lattice coupling strength of copper with ultrafast MeV electron diffraction journal October 2018
Proposal of a femtosecond megahertz repetition-rate electron diffraction instrument based on the Chinese Academy of Engineering Physics terahertz free electron laser beamline journal October 2018
Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction journal September 2019
Towards jitter-free ultrafast electron diffraction technology journal December 2019
Light-induced charge density wave in LaTe3 journal November 2019
A Compact Ultrafast Electron Diffractometer with Relativistic Femtosecond Electron Pulses journal January 2020
Towards jitter-free ultrafast electron diffraction technology text January 2019
Dynamical slowing down in an ultrafast photo-induced phase transition text January 2019
Ultrafast manipulation of mirror domain walls in a charge density wave text January 2018

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