Dissociative electron attachment to dialanine and alanine anhydride has been studied in the gas phase utilizing a double focusing two sector field mass spectrometer. We show that low-energy electrons (i.e., electrons with kinetic energies from near zero up to 13 eV) attach to these molecules and subsequently dissociate to form a number of anionic fragments. Anion efficiency curves are recorded for the most abundant anions by measuring the ion yield as a function of the incident electron energy. The present experiments show that as for single amino acids (M), e.g., glycine, alanine, valine, and proline, the dehydrogenated closed shell anion (M–H)− is the most dominant reaction product. The interpretation of the experiments is aided by quantum chemical calculations based on density functional theory, by which the electrostatic potential and molecular orbitals are calculated and the initial electron attachment process prior to dissociation is investigated.
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7 February 2011
Research Article|
February 01 2011
Bond dissociation of the dipeptide dialanine and its derivative alanine anhydride induced by low energy electrons Available to Purchase
Elahe Alizadeh;
Elahe Alizadeh
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
2Department of Physics and Astronomy,
The Open University
, Milton Keynes, MK7 6AA, United Kingdom
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David Gschliesser;
David Gschliesser
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Peter Bartl;
Peter Bartl
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Michaela Hager;
Michaela Hager
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Achim Edtbauer;
Achim Edtbauer
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Violaine Vizcaino;
Violaine Vizcaino
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Andreas Mauracher;
Andreas Mauracher
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Michael Probst;
Michael Probst
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Tilmann D. Märk;
Tilmann D. Märk
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Sylwia Ptasińska;
Sylwia Ptasińska
2Department of Physics and Astronomy,
The Open University
, Milton Keynes, MK7 6AA, United Kingdom
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Nigel J. Mason;
Nigel J. Mason
2Department of Physics and Astronomy,
The Open University
, Milton Keynes, MK7 6AA, United Kingdom
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Stephan Denifl;
Stephan Denifl
a)
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Paul Scheier
Paul Scheier
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
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Elahe Alizadeh
1,2
David Gschliesser
1
Peter Bartl
1
Michaela Hager
1
Achim Edtbauer
1
Violaine Vizcaino
1
Andreas Mauracher
1
Michael Probst
1
Tilmann D. Märk
1
Sylwia Ptasińska
2
Nigel J. Mason
2
Stephan Denifl
1,a)
Paul Scheier
1
1Institut für Ionenphysik and Angewandte Physik, and Center of Molecular Biosciences Innsbruck,
Universität Innsbruck
, Technikerstraße 25, A-6020 Innsbruck, Austria
2Department of Physics and Astronomy,
The Open University
, Milton Keynes, MK7 6AA, United Kingdom
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Chem. Phys. 134, 054305 (2011)
Article history
Received:
September 21 2010
Accepted:
December 30 2010
Citation
Elahe Alizadeh, David Gschliesser, Peter Bartl, Michaela Hager, Achim Edtbauer, Violaine Vizcaino, Andreas Mauracher, Michael Probst, Tilmann D. Märk, Sylwia Ptasińska, Nigel J. Mason, Stephan Denifl, Paul Scheier; Bond dissociation of the dipeptide dialanine and its derivative alanine anhydride induced by low energy electrons. J. Chem. Phys. 7 February 2011; 134 (5): 054305. https://doi.org/10.1063/1.3544217
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