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cpylovelove銅蟲 (小有名氣)
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[求助]
Gaussian計算NBO布居數(shù)反轉(zhuǎn)是什么意思 已有1人參與
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在計算NBO時,同一個輸入結(jié)構(gòu),用小的基組算沒問題,改成大的基組之后計算NBO的時候輸出文件中警告: WARNING: 1 low occupancy (<1.9990e) core orbital found on C 50 1 low occupancy (<1.9990e) core orbital found on C 51 1 low occupancy (<1.9990e) core orbital found on C 54 1 low occupancy (<1.9990e) core orbital found on C 57 WARNING: Population inversion found on atom O 1 Population inversion found on atom O 2 Population inversion found on atom O 3 Population inversion found on atom O 4 Population inversion found on atom O 5 Population inversion found on atom O 6 Population inversion found on atom O 8 然后就沒有然后了。。沒有Donor NBO (i) Acceptor NBO (j) 那部分了,這是什么原因?求指導(dǎo)! 輸入文件: %mem=12GB %nprocshared=4 %chk=\NBO222.chk #6-311+g(d,p) m062x pop=nboread structure 0 1 O 0.46554900 -2.26311600 1.14531900 O -0.08446700 -2.94697200 -0.82428500 O -0.41942000 1.93710600 -2.62250800 O 0.34933900 2.55473300 -0.70307400 O -3.05918900 -3.48606000 0.03092800 O -4.84957500 -2.49305800 0.7434 。。 $NBO PLOT $END |
木蟲 (著名寫手)
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不知道你最后是正常跑完了還是出現(xiàn)l607錯誤? 正常跑完的情況下引用論壇老帖和高斯NBO的解釋: http://www.gaoyang168.com/html/201306/6005253.html Such warnings can usually be ignored. > WARNING: 1 low occupancy (<1.9990e) core orbital found on P 3 > 1 low occupancy (<1.9990e) core orbital found on C 5 In the first case NBO has calculated a couple core orbitals with occupancies slightly lower than threshold. The occupancies reflect delocalizing interactions of the two core orbitals with nearby acceptor functions. But the strengths of these interactions are likely so weak that they can be neglected. Examine the perturbative analysis for interactions involving the two orbitals in question. You'll probably find that the interactions are weaker than a kcal/mol or two and can thus be ignored when developing a qualitative description of the calculated wavefunction. > WARNING: Population inversion found on atom P 3 > Population inversion found on atom O 4 > Population inversion found on atom C 5 > Population inversion found on atom C 6 > Population inversion found on atom C 7 > Population inversion found on atom C 8 > Population inversion found on atom C 9 > Population inversion found on atom C10 > Population inversion found on atom O11 > Population inversion found on atom S13 In the second case NBO has encountered a high energy NAO that has an occupancy somewhat greater than a lower energy NAO. This is a fairly common occurence for extended basis sets for which there are a considerable number of Rydberg orbitals identified by NAO. Examine the output for P3, for example. You might find a 6s NAO with slightly higher occupancy than the 5s, or something similar. However, the occupancies of these orbitals are probably small enough that they can neglected anyway. Eric Glendening 出現(xiàn)錯誤的情況似乎跟基組有關(guān),這篇帖子的方法可以一試,但不一定能解決 http://www.gaoyang168.com/html/201105/3251569.html |
銅蟲 (小有名氣)
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