An ultrafast electron microscope gun driven by two-photon photoemission from a nanotip cathode
2015
We experimentally and numerically investigate the performance of an advanced ultrafast electron source, based on two-photon photoemission from a tungsten needle cathode incorporated in an electron microscope gun geometry. Emission properties are characterized as a function of the electrostatic gun settings, and operating conditions leading to laser-triggered electron beams of very low emittance (below 20 nm mrad) are identified. The results highlight the excellent suitability of optically driven nano-cathodes for the further development of ultrafast transmission electron microscopy.
Keywords:
- Scanning electron microscope
- Nuclear magnetic resonance
- Energy filtered transmission electron microscopy
- Scanning transmission electron microscopy
- Electron beam-induced deposition
- Cathode
- Transmission electron microscopy
- Analytical chemistry
- Reflection high-energy electron diffraction
- Electron microscope
- Physics
- Optics
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