Ultracold electron source for single-shot diffraction studies

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Abstract

Abstract. Ultracold electron sources, which are based on near-threshold photo- and field-ionization of a cloud of laser-cooled atoms, offer the unique combination of low emittance and extended size that is essential for achieving single-shot, ultrafast electron diffraction of macromolecules. Here we present measurements of the effective temperature of such a pulsed electron source employing rubidium atoms that are magneto-optically trapped at the center of an accelerator structure. Transverse source temperatures ranging from 200 K down to 10 K are demonstrated, controllable with the wavelength of the ionization laser. Together with the 50 µm source size, the achievable temperature enables a transverse coherence length of 20 nm for a 100 µm sample size.
Original languageEnglish
Article number46004
Pages (from-to)46004-1/5
Number of pages5
JournalEPL
Volume91
Issue number4
DOIs
Publication statusPublished - 2010

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