We report calculated total elastic cross sections Qel, total ionisation cross sections, Qion, summed total excitation cross sections Qexc and total cross sections QT for CH3SH upon electron impact for energies from ionisation threshold to 5 keV. We have employed Spherical Complex Optical Potential (SCOP) formalism to calculate total elastic cross section Qel, and total inelastic cross section Qinel and used Complex Scattering Potential – the ionisation contribution (CSP-ic) method to extract the ionisation cross sections, Qion, from the calculated Qinel. The calculated total cross sections are examined as functions of incident electron energy and are compared with available data wherever possible and overall good agreement is observed. In this work Qel, Qion, and summed of Qexc are reported for the first time for CH3SH in this energy range.

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.