Abstract
We numerically investigate the suitability of photoexcited nanotips as a source of coherent femtosecond single electron pulses for ultrafast surface-sensitive electron diffraction and non-destructive imaging with low-energy electrons. The experimental parameters for realizing hundred femtosecond time resolution are identified by evaluating the effects of vacuum dispersion and beam divergence on the temporal broadening of the electron wave packet during its propagation to the sample.
Highlights
Within the last few years there has been tremendous progress in the generation of ultrashort electron pulses, which allow direct probing of femtosecond structural dynamics using optical pump-electron probe techniques such as ultrafast electron diffraction [1,2]
We numerically investigate the suitability of photoexcited nanotips as a source of coherent femtosecond single electron pulses for ultrafast surface-sensitive electron diffraction and non-destructive imaging with low-energy electrons
The experimental parameters for realizing hundred femtosecond time resolution are identified by evaluating the effects of vacuum dispersion and beam divergence on the temporal broadening of the electron wave packet during its propagation to the sample
Summary
Within the last few years there has been tremendous progress in the generation of ultrashort electron pulses, which allow direct probing of femtosecond structural dynamics using optical pump-electron probe techniques such as ultrafast electron diffraction [1,2]. Operated at low DCvoltages, nanotips are especially attractive as a pulsed low-energy electron gun for use in timeresolved electron diffraction experiments In view of this potential application and in particular for the time resolution, it is essential to consider propagation effects of the electron wave packets between tip and sample. Our results are applicable to pump-probe surface-sensitive electron diffraction in a reflective geometry as well as to ultrafast transmission experiments using forward diffraction and non-destructive imaging with low-energy electrons.
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