Duan Chang-Kui, Ruan Gang, Reid Michael F
Institute of Applied Physics and College of Electronic Engineering, Chongqing University of Post and Telecommunications, Chongqing 400065, China.
J Chem Phys. 2004 Nov 1;121(17):8183-6. doi: 10.1063/1.1802791.
Perturbative contributions to single-beam two-photon transition rates may be divided into two types. The first, involving low-energy intermediate states, require a high-order perturbation treatment, or an exact diagonalization. The other, involving high-energy intermediate states, only require a low-order perturbation treatment. We show how to partition the effective transition operator into two terms, corresponding to these two types, in such a way that a many-body perturbation expansion may be generated that obeys the linked cluster theorem and has a simple diagrammatic representation.
对单光束双光子跃迁速率的微扰贡献可分为两类。第一类涉及低能中间态，需要高阶微扰处理或精确对角化。另一类涉及高能中间态，只需要低阶微扰处理。我们展示了如何将有效跃迁算符划分为对应于这两类的两项，使得可以生成一个遵循关联簇定理并具有简单图形表示的多体微扰展开式。
