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.
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Original Russian Text © M.V. Muftakhov, P.V. Shchukin, R.V. Khatymov, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 9, pp. 1534–1541.
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Muftakhov, M.V., Shchukin, P.V. & Khatymov, R.V. Resonant electron capture by orotic acid molecules. Russ. J. Phys. Chem. 91, 1730–1736 (2017). https://doi.org/10.1134/S0036024417090229
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DOI: https://doi.org/10.1134/S0036024417090229