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REC mass spectra of trialanine, A3, (a), glycine-glycine-leucine, GGL, (b) and YFF amide (c) all recorded with electron energy of 1–2 eV. The ion peak in panel (c) marked with a star corresponds to loss of a hydrogen atom and two water molecules; ion peaks with two and three stars are tentatively assigned, respectively, on the basis of losses of two and three side chains, whose formation mechanisms are not yet clear.
