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Hydration of Nucleobase as Probed by Electron Emission of Uridine-5′-Mono-Phosphate (UMP) in Aqueous Solution Induced by Nitrogen K-Shell Ionization

机译:氮磷 - 壳电离诱导的尿素-5'-磷酸盐(UMP)电子发射核酸酶的水合

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To identify the precise early radiation processes of DNA lesions, we measure electron kinetic energy spectra emitted from uridine-5′ monophosphate (UMP) in aqueous solution for the photoionization of the N 1s orbital electron and for the following Auger effect using a monochromatic soft X-ray synchrotron radiation at energies above the nitrogen K-shell ionization threshold. The change of photoelectron spectra for UMP in aqueous solutions at different proton concentrations (pH = 7.5 and 11.3) is ascribed to the chemical shift of the N3 nitrogen atom in uracil moiety of canonical and deprotonated forms. The lowest double ionization potentials for aqueous UMP at different pH obtained from the Auger electron spectra following the N 1s photoionization values show the electrostatic aqueous interaction of uracil moiety of canonical (neutral) and deprotonated (negatively charged) forms with hydrated water molecules.
机译:为了鉴定DNA病变的精确早期辐射过程,我们测量从尿苷-5'单磷酸盐(UMP)中的电子动能光谱在水溶液中,用于使用单色软X的N 1S轨道电子的光相消除,并用于以下螺旋螺旋效果 -Rey在氮k-壳电离阈值上方的能量时的同步辐射。 在不同质子浓度(pH = 7.5和11.3)的水溶液中对UMP的光电子光谱的变化归因于规范和质子化形式的尿嘧啶部分中N3氮原子的化学位移。 在N 1S光相消化值之后的螺旋钻电子光谱中获得的不同pH下的水性UMP的最低双电离电位显示尿嘧啶(中性)尿嘧啶部分的静电水性相互作用,并用水水分子形成脱质(带负电)的形式。

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