@article{bormann_ultrafast_2015,
	title = {An ultrafast electron microscope gun driven by two-photon photoemission from a nanotip cathode},
	volume = {118},
	issn = {0021-8979, 1089-7550},
	url = {http://scitation.aip.org/content/aip/journal/jap/118/17/10.1063/1.4934681},
	doi = {10.1063/1.4934681},
	abstract = {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.},
	number = {17},
	urldate = {2015-11-24},
	journal = {Journal of Applied Physics},
	author = {Bormann, Reiner and Strauch, Stefanie and Schäfer, Sascha and Ropers, Claus},
	month = nov,
	year = {2015},
	keywords = {Surface photoemission, Time resolved imaging, brightness, cathodes, photoemission},
	pages = {173105},
}

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