Electron impact total ionization cross sections for all the components of DNA and RNA molecule

Present paper reports electron impact total ionization cross sections (Qion) for all the components of DNA and RNA molecules from threshold to 2000 eV. We have employed spherical complex optical potential (SCOP) formalism to calculate the total inelastic cross sections and have deduced total ionization cross sections using complex scattering potential-ionization contribution (CSP-ic) method. DNA and RNA being the complex molecules, these cross sections are evaluated using the group additivity rule. The present results find good accord with the available previous theoretical estimates. In absence of experimental data for these biomolecules, the present theoretical estimates prove to be the reference data source. Qion for sugar phosphate backbone of RNA and for complete DNA and RNA units are reported for the first time in this work.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (115 K)Download as PowerPoint slideHighlights► The total ionization cross sections (TICS) for all components of the DNA and RNA. ► Complex scattering potential-ionization contribution method used for calculation. ► We have employed group additivity rule for our calculations. ► TICS for RNA backbone and complete RNA and DNA units are reported for the first time.