Characteristics of laser produced plasmas of hafnium and tantalum in the 1–7 nm region Bowen Li, Takamitsu Otsuka, Emma Sokell, Padraig Dunne, Gerry O’Sullivan, Hiroyuki Hara, Goki Arai, Toshiki Tamura, Yuichi Ono, Thanh-Hung Dinh and Takeshi Higashiguchi Eur. Phys. J. D, 71 11 (2017) 278 Published online: 07 November 2017 DOI: 10.1140/epjd/e2017-70830-6