High-energy collision-activated and electron-transfer dissociation of gas-phase complexes of tryptophan with Na+, K+, and Ca2+Akimasa Fujihara, Yuki Sha, Sou Matsuo, Michisato Toyoda and Shigeo HayakawaEur. Phys. J. D, 68 10 (2014) 273DOI: https://doi.org/10.1140/epjd/e2014-50302-5