用有效算符和图解法计算稀土离子单束双光子吸收跃迁速率
Calculation of single-beam two-photon absorption transition rate of rare-earth ions using effective operator and diagrammatic representation
摘要：
单束双光子跃迁计算中所需的有效算子已经用与Duan及其同事建议的类型类似的修改的Goldstone图表示[J. Chem. Phys. 121，5071（2004）]。计算这些图的规则不同于计算有效哈密顿量和单光子跃迁算符的规则。验证了所考虑的扰动项只包含连通图，并简化和明确给出了求值规则。
英文摘要：
Effective operators needed in single-beam two-photon transition calculations have been represented with modified Goldstone diagrams similar to the type suggested by Duan and co-workers [J. Chem. Phys. 121, 5071 (2004) ]. The rules to evaluate these diagrams are different from those for effective Hamiltonian and one-photon transition operators. It is verified that the perturbation terms considered contain only connected diagrams and the evaluation rules are simplified and given explicitly.
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