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Ultrafast imaging of photoelectron packets generated from graphite surface

Appl. Phys. Lett. 95, 181108 (2009); doi:10.1063/1.3259779

Published 5 November 2009

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Ramani K. Raman, Zhensheng Tao, Tzong-Ru Han, and Chong-Yu Ruan
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA
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. ©2009 American Institute of Physics
History: Received 11 August 2009; accepted 16 October 2009; published 5 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/181108/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.47.J-
    Ultrafast pump/probe spectroscopy (<1 ps) in condensed matter
  • 79.60.Bm
    Photoelectron spectra of clean metal, semiconductor, and insulator surfaces
  • 72.20.Ht
    High-field transport and nonlinear effects (semiconductors/insulators)
  • 79.40.+z
    Thermionic emission (from surfaces)
  • 72.80.Sk
    Electrical conductivity of insulators
  • YEAR: 2010

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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