Ultrafast core-loss spectroscopy in four-dimensional electron microscopy

Structural Dynamics
Renske M van der VeenAhmed H Zewail

Abstract

We demonstrate ultrafast core-electron energy-loss spectroscopy in four-dimensional electron microscopy as an element-specific probe of nanoscale dynamics. We apply it to the study of photoexcited graphite with femtosecond and nanosecond resolutions. The transient core-loss spectra, in combination with ab initio molecular dynamics simulations, reveal the elongation of the carbon-carbon bonds, even though the overall behavior is a contraction of the crystal lattice. A prompt energy-gap shrinkage is observed on the picosecond time scale, which is caused by local bond length elongation and the direct renormalization of band energies due to temperature-dependent electron-phonon interactions.

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Citations

Apr 3, 2016·The Review of Scientific Instruments·Alexander GliserinPeter Baum
Jan 23, 2016·Structural Dynamics·F Carbone
Dec 16, 2016·ACS Applied Materials & Interfaces·Aniruddha AdhikariOmar F Mohammed
Mar 9, 2017·Journal of the American Chemical Society·Zixue SuAhmed H Zewail
Oct 7, 2016·Faraday Discussions·T J PenfoldG Vankó
Oct 28, 2015·Nature Communications·A GliserinP Baum
Sep 2, 2019·The Review of Scientific Instruments·W VerhoevenO J Luiten
Apr 29, 2020·Structural Dynamics·Daniel X Du, David J Flannigan
Jun 14, 2020·Nature Communications·Omid ZandiRenske M van der Veen
May 23, 2017·Structural Dynamics·Young Min LeeOh-Hoon Kwon
Sep 18, 2018·Structural Dynamics·Dominik EhbergerPeter Baum
Jun 6, 2017·Structural Dynamics·Gero StoreckClaus Ropers
Sep 5, 2017·Structural Dynamics·Majed Chergui, John Meurig Thomas
Apr 9, 2020·Structural Dynamics·Jianfeng ZhaoOmar F Mohammed
Mar 21, 2018·Chemical Reviews·Thomas J PenfoldChristel M Marian

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Methods Mentioned

BETA
transmission electron microscopy
X-ray
profiler
electron diffraction

Software Mentioned

FEFF

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