Semiclassical closed orbit theory has been extensively used to explain the photo-absorption spectra of atoms in external fields due to its clear physical picture and wide availability.

半经典闭合轨道理论由于具有物理图像清晰、可近乎解析处理等特点被普遍用来解释原子或离子在强外场中的光吸收现象，成为实现联结经典理论和量子世界的重要桥梁。

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Using molecular closed orbit theory and the region splitting and consistent iterative method, we firstly compute the recurrence spectra of NO molecule in strong magnetic field theoretically.

利用分子的闭合轨道理论和分区自洽的迭代方法，首次从理论上计算了NO分子在强磁场中的回归谱。

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The spontaneous emission rate of two interacting excited atoms near a dielectric interface is studied using the photon closed-orbit theory and the dipole image method.

利用光子的闭合轨道理论和偶极成像的方法，研究了两个相互作用的原子在电介质界面附近的自发辐射率。

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