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【求助】siesta計算中,如何進行BSSE修正?
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即基組重疊誤差,全稱為Basis Set Superposition Error(BSSE)。對于雙分子A和B的相互作用能應該表述為E_interaction = E_AB - E_A - E_B + E_BSSE。第三項即為修正項。對于弱相互作用,E_BSSE所占E_interaction的比例往往不小,甚至超過它,如果不進行校正,可能正負號都不對。 這些也是從網(wǎng)上查到的,但是網(wǎng)上主要介紹的都是高斯算法中的BSSE修正,由于本人用siesta算,想麻煩各位高手多多賜教!! |
atk&transiesta |
新蟲 (初入文壇)
木蟲 (著名寫手)
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不知道你算的是分子還是固體,建議不要用它來討論。你可在userguide里搜一下,我沒看有什么人用siesta討論過BSSE,在userguide里的27頁提到了BSSE。不過具體怎么做還不知道。說明書中只提到PAO.Basis里設(shè)置時,用Ghost原子可以處理BSSE。不過如果根據(jù)你上面的定義,我想可以這樣E_interaction = E_AB - E_A - E_B + Sum_E_BSSE,其中Sum_E_BSSE為A,B單個的BSSE之和。也就是說用鬼原子來處理BSSE,然后根據(jù)上面求的 |
木蟲 (著名寫手)

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What we calculated is the Basis Set Superposition Error (BSSE) that is an error occurring when you use a finite basis set to study, for example, a chemical reaction. In a tipical reaction you calculate the electronic structure of the reactants separately, let us say A and B, and then the electronic structure of the product, A+B. What happens in this case is that you are using different basis sets to represent the reactants in each step of the calculation. When you calculate the isolated reactant A, you use the basis set of A, and the electrons of A will be arranged spatially on these provided orbitals. However, when you put both systems together in the A+B, the electrons of A will have now a greater spatial freedom, since they can now occupy orbitals coming from B. The same happens with B. You have different basis sets to distribute the electrons of A in the two situations. To correct this, you need to recalculate the energy of the isolated reactants (A and B) by considering the basis set of both reactants, i.e., the calculations of the isolated reactant A will now include the basis sets of B (without the system B itself). It needs to be done for each configuration that you take into account in the reaction of A+B. Now you will have the same basis set for the isolated reactants and the product. You can look for more information searching for "counterpoise correction" |
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