Hot electron capture dissociation

F. Kjeldsen and R. A. Zubarev, Secondary losses via y-lactam formation in hot electron capture dissociation A missing link to complete de Novo sequencing of proteins /. Am. Chem. Soc., 125 (2003) 6628-6629. 

F. Kjeldsen, K. F. Sorensen, and R. A. Zubarev, Distribution of Iie/Leu amino acid residues in the PP3 protein by (hot) electron capture dissociation in Fourier transform ion cyclotron resonance mass spectrometry, Anal. Chem., 75 (2003) 1267-1274. 

Irradiation of the molecular radical anion of DESO, which has a yellow color, with light of X = 350-400 nm partially restores the red color and the ESR spectrum of the radical-anion pair. Similarly to the case of DMSO-d6 a comparison of the energetics of the photodissociation of the radical anion and dissociative capture of an electron by a DESO molecule permits an estimation of the energy of the hot electrons which form the radical-anion pair of DESO. This energy is equal to 2eV, similarly to DMSO-d6. The spin density on the ethyl radical in the radical-anion pair of DESO can be estimated from the decrease in hfs in comparison with the free radical to be 0.81, smaller than DMSO-d6. 

Kieldsen, F Haselmann, K. Budnik, B. A. Jensen, F Zubarev, R. A. Dissociative capture of hot electrons by polypeptide polycations An Efficient process accompanied by secondary fragmentation. Chem. Phys. Lett. 2002, 356, 201-206. 

Photochemistry of adsorbed O2 molecules results presumably from transient capture of an excited metal electron by the 3cr state of O2. After decay to the ground state, the excited molecules may rapidly diffuse, desorb, or dissociate [72]. By monitoring the coUision-induced desorption of coadsorbed noble gas atoms, a value of 0.7 eV for the kinetic energy of the fastest "hot" O adatoms was determined [73]. 

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