1. Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland
2. Institute of Physics, Laboratory of Physics of Living Matter, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
3. Centre for Biospectroscopy and School of Chemistry, Monash University, 3800 Clayton, Victoria, Australia