量子辐射过程中的算符序
Operator Ordering in Quantum Radiative Processes
摘要：
本文在偶极近似下重新研究了库仑规范中原子电子的量子电动力学，并在考虑物理观测量变化率的情况下，用Dalibard，Dupont-Roc和Cohen-Tannoudji（DDC）方法计算了原子能级的移动.然后我们分析了偶极近似相互作用哈密顿量中算符有序性的物理解释，讨论了二阶束缚态微扰理论中统计函数的任意性。
英文摘要：
In this work we reexamine quantum electrodynamics of atomic eletrons in the Coulomb gauge in the dipole approximation and calculate the shift of atomic energy levels in the context of Dalibard, Dupont-Roc and Cohen-Tannoudji (DDC) formalism by considering the variation rates of physical observables. We then analyze the physical interpretation of the ordering of operators in the dipole approximation interaction Hamiltonian in terms of field fluctuations and self-reaction of atomic eletrons, discussing the arbitrariness in the statistical functions in second order bound-state perturbation theory.
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