VUV photofragmentation of protonated leucine-enkephalin peptide dimer below ionization energy Aleksandar R. Milosavljević, Viktor Z. Cerovski, Miloš Lj. Ranković, Francis Canon, Laurent Nahon and Alexandre Giuliani Eur. Phys. J. D, 68 3 (2014) 68 Published online: 25 March 2014 DOI: 10.1140/epjd/e2014-40826-y