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Selectivity in fragmentation of N-methylacetamide after resonant K-shell excitation
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2014 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 29, 15231-15240 p.Article in journal (Refereed) Published
Abstract [en]

The fragmentation pattern of the peptide model system, N-methylacetamide, is investigated using ion time-of-flight (TOF) spectroscopy after resonant K-shell excitation. Corresponding near-edge X-ray absorption fine structure (NEXAFS) spectra recorded at high resolution at the C1s, N1s and O1s edges are presented. Analysis of the ion TOF data reveals a multitude of fragmentation channels and dissociation pathways. Comparison between the excitation of six different resonances in the vicinity of the C1s, N1s and O1s edges suggests evidence for site-selective bond breaking. In particular the breaking of the peptide bond and the N-C-alpha bond show a clear correlation with resonant excitation at the N1s edge. Also, stronger tendencies towards site-selective bond breaking are found for the generation of single ions compared with ion pairs. Analysis of angular distributions of ions from breakage of the peptide bond yields a fragmentation time of <400 fs.

Place, publisher, year, edition, pages
2014. Vol. 16, no 29, 15231-15240 p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-230538DOI: 10.1039/c4cp01067aISI: 000339173700022OAI: oai:DiVA.org:uu-230538DiVA: diva2:740898
Available from: 2014-08-26 Created: 2014-08-26 Last updated: 2017-12-05Bibliographically approved

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