Energy levels, transition data and collisional excitation cross-section of Sn3+ and Sn4+ ions

•Excitation energies, transition data and lifetime of Sn3+ and Sn4+ ions is reported.•Collisional excitation cross-section data of Sn3+ and Sn4+ ions is also studied.•Discrepancies in excitation energies and transition wavelengths of Sn3+ and Sn4+ ions are discussed in detail.•Fine-structure splitting of Sn3+ ion is compared with available data and discussed in detail. We have calculated atomic data such as energy levels, transition wavelengths, oscillator strengths, transition rates, lifetimes and Collision cross-section for Sn3+ and Sn4+ ions. We have employed Flexible atomic code (FAC) in our computations. We have computed lowest 31 and 17 fin. structure levels for Sn3+ and Sn4+ resp. We have provided transition data for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2) and magnetic quadrupole (M2) transitions among lowest 31 levels and 17 levels for Ag-like Sn and Pd-like Sn resp. We have also reported collision cross-section for Ag-like and Pd-like Sn from ground state to lowest 31 levels and 17 levels resp. We have compared our calculated data with available theoretical and experimental results and discussed difference between them. Extremely large lifetime of 4d95 s levels of Sn4+ ion is predicted in this work.