Production of Similar Fragments from the Glycine, Alanine, and Methionine Amino Acid Molecules under Low-Energy Electron Impact
L.G. Romanova a, J. Tamuliene b, V.S. Vukstich a, T.A. Snegurskaya c, A.V. Papp a, and A.V. Snegurskya
aInstitute of Electron Physics, Ukrainian National Academy of Sciences, 21 Universitetska str., 88017 Uzhgorod, Ukraine
bVilnius University, Institute of Theoretical Physics and Astronomy, 12 A. Goštauto str., 01108, Vilnius, Lithuania
cUzhgorod National University, Department of Physics, 46 Pidhirna str., 88000 Uzhgorod, Ukraine
Received: March 30, 2015; In final form: April 24, 2015
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Production of the ionic fragments of the same chemical composition due to a low-energy electron impact on the glycine, alanine, and methionine amino acid molecules has been studied both experimentally and theoretically. The mass-spectrometric technique was applied to detect the above ionic fragments within the 1-720 a.m.u. mass range with the ± 0.25 a.m.u. resolution, while the density functional theory based theoretical approach allowed the relevant species to be identified and the mechanisms of their production to be clarified. A special attention has been paid to analysis of the geometrical structures of the molecules under study as well to finding the appearance potentials of their fragments with the accuracy of ±0.1 eV.

DOI: 10.12693/APhysPolA.128.15
PACS numbers: 34.50.Lf, 34.90.+q