Electron-impact single ionization is investigated for the levels of the ground $3d^5$ and long-lived $3d^{4}4s$ configurations of the Fe^3＋ ion. In addition, the Maxwellian rate coefficients are tabulated in the study. The difference among the cross sections reaches $\sim$11% and $\sim$17% for the levels of the ground and long-lived configurations, respectively. The excitation autoionization (EA) provides the larger variation of the cross sections compared to the direct ionization (DI). It is demonstrated that the EA cross sections for the levels of the ground configuration vary more strongly compared to the values calculated for the excited configuration. On the other hand, the DI cross sections evaluated for the levels of the ground configuration agree within $\sim$4% while the difference of $\sim$9% is obtained for the levels of the long-lived configuration.

研究了地面水平的电子撞击单电离 $3d^5$ 并且长寿 $3d^{4}4秒$Fe ³⁺离子的构型。此外，研究中还列出了麦克斯韦速率系数。横截面之间的差异达到$～$11% 和 $～$地面和长寿命配置的水平分别为 17%。与直接电离 (DI) 相比，激发自电离 (EA) 提供了更大的横截面变化。结果表明，与为激发配置计算的值相比，接地配置级别的 EA 横截面变化更大。另一方面，针对地面配置水平评估的 DI 横截面在$～$4% 而差异 $～$9% 是针对长寿命配置的水平获得的。