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[求助]
out文件收斂問(wèn)題
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| 高斯算完打開(kāi)out文件查看了下,4個(gè)收斂標(biāo)準(zhǔn)都yes了,可是往下看還有那4個(gè)收斂標(biāo)準(zhǔn)的,其中前兩個(gè)是yes,后兩個(gè)是no。這是怎么回事?有什么影響么 |

木蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (正式寫(xiě)手)
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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. 樓主說(shuō)的這種情況在Gauss里面有時(shí)是可以允許的。 |

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是做優(yōu)化和頻率,出來(lái)下面的信息了:Item Value Threshold Converged? Maximum Force 0.000208 0.000450 YES RMS Force 0.000040 0.000300 YES Maximum Displacement 0.001659 0.001800 YES RMS Displacement 0.000269 0.001200 YES Predicted change in Energy=-3.173785D-07 Optimization completed. 頻率列出來(lái)之后又出現(xiàn)了:Item Value Threshold Converged? Maximum Force 0.000208 0.000450 YES RMS Force 0.000040 0.000300 YES Maximum Displacement 0.210729 0.001800 NO RMS Displacement 0.028618 0.001200 NO Predicted change in Energy=-1.450021D-05 GradGradGradGradGradGradGradGradGradGradGradGradGra 高斯還是正常結(jié)束的,我用的是g09 請(qǐng)高人指點(diǎn)究竟是什么原因,有什么影響。我也查看了其他的out文件,有的是這種情況,有的是2次都是4個(gè)yes,有的是出現(xiàn)了yes列出頻率后就沒(méi)有另外的收斂信息了。 |
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