A VUV detection system for the direct photonic identification of the first excited isomeric state of 229Th Benedict Seiferle, Lars von der Wense, Mustapha Laatiaoui and Peter G. Thirolf Eur. Phys. J. D, 70 3 (2016) 58 Published online: 15 March 2016 DOI: 10.1140/epjd/e2016-60653-4