Affiliation:
1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA.
Abstract
Watching Graphite Breathe
Electron microscopy is best known for its capacity to resolve spatial features. In a variant of the technique termed electron energy loss spectroscopy (EELS), the kinetic energy dissipated as the electron probe beam penetrates a sample can be quantified to characterize the material's underlying electronic structure.
Carbone
et al.
(p.
181
) have achieved femtosecond time resolution in an EELS study of graphite, and thereby traced the correlated motion of electrons and nuclei when the sample is heated by laser irradiation. The laser pulse induces rapid compression and then expansion of the layers in graphite's sheet structure. Concurrently, EELS uncovers shifts in delocalized electronic excitations, or plasmons. Layer compression coincides with a population shift from surface to bulk (that is, interlayer) plasmons, with the reverse shift accompanying expansion.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
169 articles.
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