Spectroscopy of low lying transitions of He confined in a fullerene cage Supriya K. Chaudhuri, Prasanta K. Mukherjee and Burkhard Fricke Eur. Phys. J. D, 70 10 (2016) 196 Published online: 04 October 2016 DOI: 10.1140/epjd/e2016-70346-7