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。

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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。

youdao