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kellym銀蟲 (初入文壇)
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[求助]
結(jié)構(gòu)優(yōu)化及頻率計(jì)算問題 已有2人參與
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優(yōu)化后沒有虛頻,也得到四個YES,但是看Low frequencies第一行三平三轉(zhuǎn)里面有4個負(fù)值,雖然比較小但是不知道可不可以忽略,所以加了tight和verytight試了一下,雖然小了一點(diǎn)但是還是有負(fù)值,結(jié)果如下,這個可以忽略不計(jì)嗎還是需要更精細(xì)的計(jì)算? Full mass-weighted force constant matrix: Low frequencies --- -6.8028 -3.6875 -1.7265 -0.0009 0.0005 0.0010 Low frequencies --- 7.0244 15.9171 18.4747 Harmonic frequencies (cm**-1), IR intensities (KM/Mole), Raman scattering activities (A**4/AMU), depolarization ratios for plane and unpolarized incident light, reduced masses (AMU), force constants (mDyne/A), and normal coordinates: 1 2 3 A A A Frequencies -- 5.7437 15.6621 18.3698 ***** tight ***** Full mass-weighted force constant matrix: Low frequencies --- -6.7899 -3.6880 -1.7281 -0.0008 -0.0003 0.0005 Low frequencies --- 7.0500 15.9153 18.4725 Harmonic frequencies (cm**-1), IR intensities (KM/Mole), Raman scattering activities (A**4/AMU), depolarization ratios for plane and unpolarized incident light, reduced masses (AMU), force constants (mDyne/A), and normal coordinates: 1 2 3 A A A Frequencies -- 5.7922 15.6604 18.3674 ***** very tight ***** Full mass-weighted force constant matrix: Low frequencies --- -6.7899 -3.6880 -1.7281 -0.0008 -0.0003 0.0005 Low frequencies --- 7.0500 15.9153 18.4725 Harmonic frequencies (cm**-1), IR intensities (KM/Mole), Raman scattering activities (A**4/AMU), depolarization ratios for plane and unpolarized incident light, reduced masses (AMU), force constants (mDyne/A), and normal coordinates: 1 2 3 A A A Frequencies -- 5.7922 15.6604 18.3674 |
木蟲 (著名寫手)
專家顧問 (職業(yè)作家)
地溝油冶煉專家
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專家經(jīng)驗(yàn): +458 |

禁蟲 (正式寫手)
物化程序猿
| 應(yīng)該沒什么問題。你的verytight和tight的頻率數(shù)值是完全一樣的,說明優(yōu)化出來的幾何構(gòu)型應(yīng)該是一樣的。如果你用的是DFT的話,提高格點(diǎn)積分精度或許能進(jìn)一步減小這幾個頻率的數(shù)值 |

銀蟲 (初入文壇)
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