Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3259779
Keywords
graphite; high-speed optical techniques; hot carriers; photoelectron spectra; thermionic emission
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Funding
- Department of Energy [DE-FG02-06ER46309]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46309] Funding Source: U.S. Department of Energy (DOE)
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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.
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