Resonant electron capture by orotic acid molecules
- Authors: Muftakhov M.V.1, Shchukin P.V.1, Khatymov R.V.1
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Affiliations:
- Institute of Molecular and Crystal Physics, Ufa Research Center
- Issue: Vol 91, No 9 (2017)
- Pages: 1730-1736
- Section: Structure of Matter and Quantum Chemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/169696
- DOI: https://doi.org/10.1134/S0036024417090229
- ID: 169696
Cite item
Abstract
Resonant electron attachment by orotic acid molecules (6-COOH-uracil) are studied in the energy range of 0–14 eV via negative ion mass spectrometry. Molecular ions, whose lifetimes relative to electron autodetachment are found to be ~300 μs are recorded in the region of thermal electron energies; they form in the valence state through a vibration-excited resonance mechanism. Unlike unsubstituted uracil, most dissociative processes occur in the low-energy region of <4 eV and are due to carboxylic anions. An absolute cross section of 2.4 × 10−17 cm2 is found for the most intense fragment ions [M–H]– at an output energy of 1.33 eV. The kinetics of decarboxylation is considered for these ions. This could be a model reaction for the last stage of uridine monophosphate biosynthesis.
About the authors
M. V. Muftakhov
Institute of Molecular and Crystal Physics, Ufa Research Center
Author for correspondence.
Email: Mars@anrb.ru
Russian Federation, Ufa, 450073
P. V. Shchukin
Institute of Molecular and Crystal Physics, Ufa Research Center
Email: Mars@anrb.ru
Russian Federation, Ufa, 450073
R. V. Khatymov
Institute of Molecular and Crystal Physics, Ufa Research Center
Email: Mars@anrb.ru
Russian Federation, Ufa, 450073