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 three-dimensional second order wave diffraction and radiation in time domain are also studied in detail in the forth and fifth chapter.
第四章和第五章分别对浮体的三维绕射和辐射问题进行了较详细的研究。
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