The role of the shape resonance state in low energy electron induced single strand break in 2′-deoxycytidine-5′-monophosphate

Literature Information

Publication Date 2015-05-14
DOI 10.1039/C5CP00126A
Impact Factor 3.676
Authors

Renjith Bhaskaran, Manabendra Sarma


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Abstract

Low energy electron (LEE) induced single strand break (SSB) has been studied for 2′-deoxycytidine-5′-monophosphate (5′-dCMPH) molecules in the gas phase by means of ab initio electronic structure methods and local complex potential based time-dependent wavepacket quantum mechanical calculations. We have found that the LEE attachment to this cytidine nucleotide results in the formation of a transient metastable anion. The results obtained here show that the electron attachment takes place at the cytosine nucleobase center and within 18–20 fs, the LEE transfers to the σ* orbital of the sugar-phosphate 5′ C–O bond. The characteristic electron attachment cross section spectrum is found at ∼1 eV, which is in good agreement with the available experimental observations. Quantum mechanical tunneling of the 5′ C–O bound vibrational energy levels may contribute to SSB only above 1.5 eV energy regimes.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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