Design and implementation of a fs-resolved transmission electron microscope based on thermionic gun technology
2013
In this paper, the design and implementation of a femtosecond-resolved ultrafast transmission electron microscope is presented, based on a thermionic gun geometry. Utilizing an additional magnetic lens between the electron acceleration and the nominal condenser lens system, a larger percentage of the electrons created at the cathode are delivered to the specimen without degrading temporal, spatial and energy resolution significantly, while at the same time maintaining the femtosecond temporal resolution. Using the photon-induced near field electron microscopy effect (PINEM) on silver nanowires the cross-correlation between the light and electron pulses was measured, showing the impact of the gun settings and initiating laser pulse duration on the electron bunch properties. Tuneable electron pulses between 300 fs and several ps can be obtained, and an overall energy resolution around 1 eV was achieved. (C) 2013 Elsevier B.V. All rights reserved.
Keywords:
- Scanning electron microscope
- Scanning confocal electron microscopy
- Atomic physics
- Energy filtered transmission electron microscopy
- Chemistry
- Conventional transmission electron microscope
- Scanning transmission electron microscopy
- Electron tomography
- Electron microscope
- Reflection high-energy electron diffraction
- Analytical chemistry
- Optics
- High-resolution transmission electron microscopy
- Electron beam-induced deposition
- Correction
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