Ultracold electron source for single-shot diffraction studies G. Taban, M. P. Reijnders, B. Fleskens, S. B. van der Geer, O. J. Luiten and E. J. D. Vredenbregt EPL, 91 4 (2010) 46004 Published online: 15 September 2010 DOI: 10.1209/0295-5075/91/46004