Ultrafast core-loss spectroscopy in four-dimensional electron microscopy

Renske M. van der Veen, Thomas J. Penfold, Ahmed H. Zewail

Research output: Contribution to journalArticle

Abstract

We demonstrate ultrafast core-electron energy-loss spectroscopy in fourdimensional 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.

Original languageEnglish (US)
Article number024302
JournalStructural Dynamics
Volume2
Issue number2
DOIs
StatePublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy

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