Fitting parameters <em>a<sub>i</sub></em> of the fifth-order polynomial alpha (T_{e}) = sum ^5_{i=0} a_i T_e^i and scaling parameters <em>E</em><sub>0</sub> to reproduce the scaled PRC for Sn<sup>4 +</sup> through Sn<sup>13 +</sup> ions

<p><b>Table 3.</b> Fitting parameters <em>a<sub>i</sub></em> of the fifth-order polynomial \alpha (T_{e}) = \sum ^5_{i=0} a_i T_e^i and scaling parameters <em>E</em><sub>0</sub> to reproduce the scaled PRC for Sn<sup>4 +</sup> through Sn<sup>13 +</sup> ions. The numbers in square brackets are powers of 10 to be multiplied with the preceding numbers, respectively.</p> <p><strong>Abstract</strong></p> <p>Electron-impact single-ionization cross sections of Sn<sup><em>q</em> +</sup> ions in charge states <em>q</em> = 4–13 with 4d<sup>[10 − (<em>q</em> − 4)]</sup> outer-shell configurations have been studied in the energy range from the corresponding thresholds up to 1000 eV. Absolute cross sections and fine-step energy-scan data have been measured employing the crossed-beams technique. Contributions of different ionization mechanisms have been analysed by comparing the experimental data with calculations employing the configuration-averaged distorted wave approximation. Ionization plasma rate coefficients inferred from the experimental data are also presented.</p>