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Issue 42, 2007
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Dissociative electron attachment to gas phase glycine: Exploring the decomposition pathways by mass separation of isobaric fragment anions

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Abstract

Dissociative electron attachment to gas phase glycine generates a number of fragment ions, among them ions observed at the mass numbers 15, 16 and 26 amu. From stoichiometry they can be assigned to the chemically rather different species NH/CH3 (15 amu), O/NH2 (16 amu) and CN/C2H2 (26 amu). Here we use a high resolution double focusing two sector mass spectrometer to separate these isobaric ions. It is thereby possible to unravel the decomposition reactions of the different transient negative ions formed upon resonant electron attachment to neutral glycine in the energy range 0–15 eV. We find that within the isobaric ion pairs, the individual components generally arise from resonances located at substantial different energies. The corresponding unimolecular decompositions involve complex reaction sequences including multiple bond cleavages and substantial rearrangement in the precursor ion. To support the interpretation and assignments we also use 13C labelling of glycine at the carboxylic group.

Graphical abstract: Dissociative electron attachment to gas phase glycine: Exploring the decomposition pathways by mass separation of isobaric fragment anions

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Article information


Submitted
18 Jun 2007
Accepted
23 Aug 2007
First published
07 Sep 2007

Phys. Chem. Chem. Phys., 2007,9, 5680-5685
Article type
Paper

Dissociative electron attachment to gas phase glycine: Exploring the decomposition pathways by mass separation of isobaric fragment anions

A. Mauracher, S. Denifl, A. Aleem, N. Wendt, F. Zappa, P. Cicman, M. Probst, T. D. Märk, P. Scheier, H. D. Flosadóttir, O. Ingólfsson and E. Illenberger, Phys. Chem. Chem. Phys., 2007, 9, 5680
DOI: 10.1039/B709140K

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