Using the second order perturbation theory, the formulae of vibrational force constants are derived in part one.
运用二阶微扰理论，本文第一部分首先计算了高阶力常数的表达式。
The cross sections for such processes are calculated in second order perturbation theory and expressed in term of the intensity of laser radiation and the nuclearmatrix elements.
用二阶微拢论计算这一截面，结果表示为核矩阵元和激光电场强度的函数。
The relationship between physically observable quantities and perturbed wave vector is explored on the basis of BBGKY hierarchy equations and the second order perturbation theory.
基于BBGKY方程，采用二阶扰动理论探索了可观物理量与扰动波矢的相互关系。
The relationship between physically observable quantities and perturbed wave vector is explored on the basis of BBGKY hierarchy equations and the second order perturbation theory.
基于BBGKY方程，采用二阶扰动理论探索了可观物理量与扰动波矢的相互关系。
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