Potassium-Uracil/Thymine Ring Cleavage Enhancement As Studied in Electron Transfer Experiments and Theoretical Calculations

作者：Almeida D; Bacchus Montabonel M C^*; Ferreira da Silva F; Garcia G; Limao Vieira P

来源：Journal of Physical Chemistry A, 2014, 118(33): 6547-6552.

DOI：10.1021/jp503164a

We report experimental and theoretical studies on ring cleavage enhancement in collisions of potassium atoms with uracil/thymine to further increase the understanding of the complex mechanisms yielding such fragmentation pathways. In these electron transfer processes time-of-flight (TOP) negative ion mass spectra were obtained in the collision energy range 13.5-23.0 eV. We note that CNO- is the major ring breaking anion formed and its threshold formation is discussed within the collision energy range studied. Such a decomposition process is supported by the first theoretical calculations to clarify how DNA/RNA pyrimidine base fragmentation is enhanced in electron transfer processes yielding ion-pair formation.

• 出版日期2014-8-21