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zrcrong金蟲 (小有名氣)
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[交流]
【求助】關(guān)于帶電體的優(yōu)化 已有7人參與
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請問各位,我要對一帶電體的分子結(jié)構(gòu)進(jìn)行優(yōu)化,但總是出問題。 我優(yōu)化的結(jié)構(gòu)是硼連三個OH和一個苯環(huán),苯環(huán)另一端再連一烷烴這樣一來硼就帶負(fù)電了。在計算輸入文件中,帶電量我輸入-1,電荷自旋多重度我輸入3.用b3lyp/6-311+g(d,p)方法進(jìn)行優(yōu)化,但是優(yōu)化后出現(xiàn)以下錯誤: >>>>>>>>>> Convergence criterion not met. SCF Done: E(UB+HF-LYP) = -810.160106353 A.U. after 129 cycles Convg = 0.2295D-01 -V/T = 2.0036 S**2 = 2.0157 Annihilation of the first spin contaminant: S**2 before annihilation 2.0157, after 2.0001 Convergence failure -- run terminated. Error termination via Lnk1e in /home/gauss/g03/l502.exe at Thu Jul 22 05:52:42 2010. Job cpu time: 1 days 15 hours 20 minutes 53.6 seconds. File lengths (MBytes): RWF= 257 Int= 0 D2E= 0 Chk= 21 Scr= 1 現(xiàn)在不知該如何是好? 懇請各位大俠賜教,老板最近一直催著要結(jié)果,實在憂心! |
鐵桿木蟲 (正式寫手)
金蟲 (小有名氣)
木蟲 (小有名氣)

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金蟲 (小有名氣)
銅蟲 (初入文壇)
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The convergence is already failed, why still keep the calculation going? Its a waste of time and money!! The failure might come from the initial geometry guess not closing to the optimized one. So option 1: start with a more reasonable geometry; 2: using smaller basis set, etc. without diffuse function; then you can use the optimized one to re-optimize with larger basis set. 3: using check file/wavefunction from other method, like UHF. [ Last edited by seainthesky on 2010-7-22 at 23:56 ] |
至尊木蟲 (著名寫手)
我叫MT

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