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zzy870720z(½ð±Ò+2):ллָ½Ì 2010-11-20 08:14:28
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zzy870720z(½ð±Ò+2):ллָ½Ì 2010-11-20 08:14:28
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qasd(½ð±Ò+2):лл 2010-09-11 18:57:22
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qasd(½ð±Ò+2):лл 2010-09-11 18:57:22
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zxzj05(½ð±Ò+1):лл»ØÌû½»Á÷ 2010-09-25 22:34:07
zxzj05(½ð±Ò+1):лл»ØÌû½»Á÷ 2010-09-25 22:34:07
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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" |
5Â¥2010-09-10 19:36:33













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