| Autor: |
Bormann, Reiner, Strauch, Stefanie, Schäfer, Sascha, Ropers, Claus |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2015, Vol. 118 Issue 18, p173105-1-173105-5, 5p, 4 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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