一般来说，放热基元反应，结构过渡态出现在能量过渡念之后，吸热基元反应结构过渡态出现在能量过渡态之前。
Structure transition state occurs before energy transition state in endothermic reactions, structure transition state occurs after energy transition state in exothermic reactions.
对过渡态结构都用分析力常数矩阵计算进行了确证。
The transition state structures were further confirmed by calculating the analytical force constant matrix.
化学反应过渡态结构对化学反应机理的研究有重要作用，但实验上无法直接得到。
The transition state plays an important role in mechanism research of chemical reactions, but it is hard to determine experimentally.
化学反应过渡态结构对化学反应机理的研究有重要作用，但实验上无法直接得到。
The transition state plays an important role in mechanism research of chemical reactions, but it is hard to determine experimentally.
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