中文摘要：

本文采用全相对论扭曲波方法计算了Cd＋离子5s2S1/2→5p2P3/2电子碰撞激发总截面、磁能级的激发截面以及退激辐射光子极化度.详细讨论了电子关联效应对激发截面以及退激辐射光子极化度的影响.我们发现,在低能碰撞部分（〈10eV）,Core-价关联对电子碰撞激发截面的贡献非常重要,与不考虑Core-价关联的结果相比,Core-价关联的计算结果使得激发截面降低了1/2到2/3;在高能碰撞部分（〉80 eV）,Core-价关联的贡献不是非常明显,但与不考虑Core-价关联的结果相比,其激发截面也降低了15%.然而,对于退激辐射光子极化度,Core-价关联的贡献非常小,其影响是可以忽略的.

英文摘要：

The electron-impact excitation（EIE） cross-sections of 5s2S1/2→5p2P3/2 of Cd＋have been calculated by using the relativistic distorted-wave（RDW） method which we have developed recently.In order to discuss the electronic correlation effects,four different models are used to describe the target wave functions,namely Model A,8S,5SD and 6SD.Model A is a single configuration model,it includes 5s1/2,5p1/2 and 5p3/2 only.The 8S is a valence-valence correlation model,it considers the impacts of 6s,7s,8s and 6p,7p,8p orbitals on wave function of 5s1/2,5p3/2,respectively.The 5SD is a core-valence correlation model,it includes all the virtual single and double excitations from the 4s,4p,4d,5s and5 p shells into the unoccupied 4f,5p,5d,and 5f shells.The 6SD is also a core-valence correlation model,it includes all the virtual single and double excitations from the 4s,4p,4d,5s and 5p shells into the unoccupied 4f,5p,5d,5f,6s,6p and 6d shells.The oscillator strength calculated by Model A is 0.72,which is in disagreement with the experiment 0.55 measured by Xu et al.,while the results of 6SD 0.57 is in agreement with these of the experiment very well.For the EIE cross-sections,the core-valence correlation is very important.The results of Model A and 8S are larger than the experimental results obtained by Gomonai et al.,while the results of 5SD and 6SD is obviously smaller than the results of Model A.In low energy range（〈10 eV）,the EIE cross-sections of 5SD and 6SD is at least 70% smaller than that of Model A and it is in good agreement with the experimental results.However,the contributions of correlation effects to the linear polarization of 5p2P3/2→ 5s2S1/2emission lines after excitation are very small,while the linear polarization of Model A,5SD and 6SD are in consistent with each other and also in good agreement with other theories.But for high energies,the theoretical results have big difference from the experimental results obtained by Goto et al.