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Dissociative Electron Attachment to Amino Acids: the case of Leucine

Abstract : In this work, mechanisms that control the dissociation of Leucine amino-acid by low-energy (<10 eV) electrons are investigated. At sub-excitation energies, Dissociative Electron Attachment is initiated by a shape resonance, whereas core-excited resonances is involved at higher energies. Under the present conditions, we observe three fragment ions (Leu-H)−, (Leu-16 amu)− and anion at 42 amu. The (Leu-16)− species observed near 1.0 eV and the (m/z) 42 anion produced near 7.8 eV are interpreted to arise from the decomposition of the amino-acid side group. The (Leu-H)− anion observed at 1.1 eV is induced by from the fragmentation of the carboxylic group.
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Submitted on : Monday, July 6, 2009 - 1:38:38 PM
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H. Abdoul-Carime, C. König-Lehmann, J. Kopyra, B. Farizon, M. Farizon, et al.. Dissociative Electron Attachment to Amino Acids: the case of Leucine. Chemical Physics Letters, Elsevier, 2009, 477, pp.245-248. ⟨10.1016/j.cplett.2009.07.021⟩. ⟨in2p3-00401911⟩



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