Results of the analysis of excited primary-ion-beam admixtures possibly present in the experiment

Table 1. Results of the analysis of excited primary-ion-beam admixtures possibly present in the experiment. The calculations were performed using the Cowan code [27]. The estimated fractions are the coefficients kE obtained from fitting equation (3) to the experimental data. Calculated excitation energies are given in column 4. The experimentally obtained ionization threshold energies (T.E.), T.E. taken from NIST Atomic Spectra Database [28] and T.E. calculated within the configuration-averaged approximation are provided in columns 5, 6 and 7, respectively. The estimated excited-levels' lifetimes and flight times of ions between the source and the interaction region are provided in the last two columns, respectively. The numbers in square brackets are powers of 10 to be multiplied with the preceding numbers, respectively. Abstract Electron-impact single-ionization cross sections of Snq + ions in charge states q = 4–13 with 4d[10 − (q − 4)] 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.

表1展示了实验中可能存在的激发态初级离子束混合物的分析结果。计算过程采用Cowan代码[27]进行。估计的分数为通过将方程（3）拟合至实验数据所得的系数kE。计算得到的激发能列于第4列。第5、6、7列分别提供了实验获得的电离阈值能（T.E.）、源自NIST原子光谱数据库[28]的T.E.以及基于配置平均近似法计算的T.E.。最后两列分别提供了激发态寿命和离子在源与相互作用区域之间的飞行时间。方括号中的数字代表前一个数字的10的幂次方。摘要：在相应的阈值至1000 eV的能量范围内，研究了带电态q = 4–13的Snq+离子在4d[10 − (q − 4)]外层电子构型下的电子碰撞单离子化截面。通过交叉束技术测量了绝对截面和精细步能量扫描数据。通过将实验数据与采用配置平均畸变波近似的计算结果进行比较，分析了不同电离机制的贡献。同时，还展示了从实验数据推断出的电离等离子体速率系数。