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妖妖小企鹅

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[求助] 关于过渡态搜索里面Hessian矩阵的问题

大家好,我做了一个过渡态搜索,然后接着准备做过渡态优化(TS optimazation),但是报错说:In order to perform this calculation, a Hessian matrix must be present in the model.
A Hessian matrix can be generated by running a frequency calculation on the model.
Alternatively, a valid Hessian matrix can be imported.
Once a Hessian is present, a normal mode should then be selected.
然后我就返回我过渡态的输出文件outmol里面找关于Hessian matrix 的内容,显示的是Warning: Hessian file is not present for requested vibrational restart.
这种情况表示的是一开始就没计算这个矩阵么?我该怎么样才能让结果含有Hessian matrix ,才能进行下面的过渡态优化?在这先谢谢大家了
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