Ultrafast imaging of photoelectron packets generated from graphite surface

Abstract

We present an electron projection imaging method to study the ultrafast evolution of photoelectron density distribution and transient fields near the surface. The dynamical profile of the photoelectrons from graphite reveals an origin of a thermionic emission, followed by an adiabatic process leading to electron acceleration and cooling before a freely expanding cloud is established. The hot electron emission is found to couple with a surface charge dipole layer formation, with a sheet density several orders of magnitude higher than that of the vacuum emitted cloud.

9 pages, 4 figures. Applied Physics Letter, in press

References in corpus (3)

• Direct observation of optically induced transient structures in graphite using ultrafast electron crystallography
• The development and applications of ultrafast electron nanocrystallography
• Photovoltage Dynamics of the Hydroxylated Si(111) Surface Investigated by Ultrafast Electron Diffraction

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• Impacts of Hot Electron Diffusion, Electron-Phonon Coupling, and Surface Atoms on Metal Surface Dynamics Revealed by Reflection Ultrafast Electron Diffraction
• A brief review: Ultrafast electron diffractive voltammetry: General formalism and applications
• Carrier emission of n-type Gallium Nitride illuminated by femtosecond laser pulses