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xihuanhuan

新虫 (初入文坛)

[求助] 结构优化

各位师兄,我再用g03优化结构时出现了这种情况,位移不收敛,力已收敛且很小,大概是0.000002,但作业正常结束了,请求回答。谢谢
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yanrding

金虫 (正式写手)

【答案】应助回帖

感谢参与,应助指数 +1
如果你觉得结构合理,应该就没有问题了。
华北电力大学(北京)数理学院,计算化学,凝聚态物理。欢迎合作!招硕士/博士研究生,招老师。
2楼2012-03-31 21:08:22
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ldzh0531

木虫 (小有名气)

【答案】应助回帖

感谢参与,应助指数 +1
There is one exception to the criteria we just looked at, designed to aid in the optimization of large molecules. When the forces are two orders of magnitude smaller than the cutoff value (i.e., 1/100th of the limiting value), then the geometry is considered converged even if the displacement is larger than the cutoff value. This criteria comes into play on very, very flat potential energy surfaces near the minimum, which is common for large, floppy molecules.
楼主说的这种情况在Gauss里面有时是可以允许的。
3楼2012-03-31 21:48:13
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