常用的计算自由能的方法有热力学微扰法及热力学微积分法等。

The usual means of computing free energy are thermodynamic perturbation, thermodynamic differentiation and etc.

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利用直接微扰法，给出了该系统的一级近似波函数及能谱随时间的演化规律。

This model is solved by applying the direct perturbation method. The time evolution of spectrum and the first order approximate wave function for the system are presented.

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