类氦氙电子碰撞激发截面测量的评述
Comment on electron-impact excitation cross-section measurements for He-like Xenon
摘要：
我们讨论低于预期的碰撞激发截面的氦类氙在电子束离子阱设施测量。在一篇评论文章中（H。Chen和P. Beiersdorfer，Can. J.Phys.86，55（2008）），作者发现由于类He氙的激发过程中自由电子和束缚电子之间的Breit相互作用而产生的显著效应。作者指出，只有当计算中包括广义Breit相互作用时，才能发现测量和计算的截面值之间的一致性。我们已经进行了新的计算与多配置Dirac-Fock代码，以及与宾夕法尼亚州立大学的代码套件，我们的结论是，Breit相互作用的贡献是远远低于在上述文章中提出的计算中发现的。事实上，我们的预测值几乎是实验值的两倍。我们提出这些考虑，希望能激发新的实验研究。
英文摘要：
We discuss lower-than-predicted collisional-excitation cross-sections for helium-like xenon measured at an Electron Beam Ion Trap facility. In a review paper (H. Chen and P. Beiersdorfer, Can. J. Phys. 86, 55 (2008)), the authors find a significant effect due to the Breit interaction between the free and the bound electrons in the excitation process of He-like xenon. The authors state that the agreement between the measured and calculated cross-section values can only be found when the generalized Breit interaction is included in the calculations. We have performed new calculations with a Multi-Configuration Dirac-Fock code, as well as with the Penn State University suite of codes, and our conclusions are that the contribution of the Breit interaction is much lower than found in the calculations presented in the abovementioned article. In fact, our predictions are subsequently almost twice as large as the experimental values. We present these considerations in hopes of motivating new experimental investigations.
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