Spectroscopic investigations of corona discharge in high pressure helium at 300 K N. Bonifaci, Z. L. Li, A. Denat, V. M. Atrazhev and V. A. Shakhatov Eur. Phys. J. Appl. Phys., 55 1 (2011) 13809 Published online: 21 July 2011 DOI: 10.1051/epjap/2011100492