本文通过计算指出，若微扰只与时间有关，则体系的波函数可以精确求解，从而得到跃迁概率振幅的精确表达式。
It is pointed out that the wave function of system can be exactly solved if the perturbation only depends on the time, and the exact expression of transition probability amplitude can be obtained.
第一章是关于微扰散射振幅计算的导论和概述。
Chapter 1 begin with an introduction and overview of the computations of perturbative scattering amplitudes.
第一章是关于微扰散射振幅计算的导论和概述。
Chapter 1 begin with an introduction and overview of the computations of perturbative scattering amplitudes.
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