Atomic fluorescence emitted from a corona discharge in helium above and below saturated vapour pressure Nagham M. Shiltagh, Luis G. Mendoza Luna, Mark J. Watkins, Stuart C. Thornton and Klaus von Haeften Eur. Phys. J. D, 72 1 (2018) 5 Published online: 16 January 2018 DOI: 10.1140/epjd/e2017-80322-4