Abstract
Four 2,3-didehydro amino acids were investigated by fast ion bombardment (FIB) and ammonia chemical ionization (NH3-CI) mass Spectrometry. The protonated molecules formed by the two techniques were mass selected and their respective collision-induced dissociations (CIDs) in the translational energy range 5–200 eV (in the laboratory frame of reference) were investigated. No obvious quantitative differences between the FIB and NH3-CI mass spectra of the (E)- and (Z)-isomers were observed. Different internal excitation of the protonated molecules formed by the two techniques and the role of CID data in clarifying this particular observation are discussed.
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