For about three decades, the chemistry of cation radicals derived from organic molecules
had received a major impetus from mass spectrometry. This was because cation radicals …

Amino acid and peptide radical cations, M.+, are formed by oxidative dissociations of [Cu
(auxiliary ligand)(M)]. 2+ and [MetalIII (salen)(M)]+ complexes. The most easily formed …

The multitude of fragmentation techniques available to modern tandem mass spectrometry
introduces diversity in the types of product ions. An all-explicit nomenclature system for the …

Fragmentation pathways of peptide radical cations, M+·, with well-defined initial location of
the radical site were explored using collision-induced dissociation (CID) experiments …

Dissociation of peptide radical ions involves competition between charge-induced and
radical-induced reactions that can be preceded by isomerization. The isomeric radical …

Charge transfer mechanisms lay at the heart of chemistry and biochemistry. Proton coupled
electron transfers (PCET) are central in biological processes such as photosynthesis and in …

In this study, we observed unprecedented cleavages of the Cβ–Cγ bonds of tryptophan
residue side chains in a series of hydrogen-deficient tryptophan-containing peptide radical …

The molecular structures of six open-shell z3-ions resulting from electron transfer
dissociation mass spectrometry (ETD MS) were investigated using infrared ion spectroscopy …

Fragmentation of radical cationic peptides [R (G) n− 2X (G) 7− n]˙+ and [R (G) m− 2XG]˙+(X=
Phe or Tyr; m= 2–5; n= 2–7) leads selectively to an+ product ions through in situ Cα–C …

Gas phase fragmentations of two isomeric radical cationic tripeptides of
glycylglycyltryptophan[G• GW]+ and [GGW]•+ with well-defined initial radical sites at the α …