| 查看: 1240 | 回复: 4 | |||
[求助]
请教各位大侠,高斯技术部的回复。控制电子排布轨道的具体操作如何执行?
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F: In my research,I expect to allocate certain electron to assigned orbitals. But I'm not sure G09 can do it, and if can, how to set the keywords? A:There are a couple of different ways people like to think about placing electrons and most of them are inconsistent with SCF methods which are solving the electronic wavefunction for the lowest energy and often undoes any attempt to place electrons. The cases where you can do this are when you have different spin or space symmetry. So you can always do the lowest singlet and triplet energies because they are orthogonal by spin symmetry. Similarly if your molecule has symmetry you can make different triplets. Finally in some cases it is possible to build up localized spin states which are stable. We have a worked example at our web site, www.gaussian.com/g_tech/afc.htm which does this for a binuclear metal system. The Guess=(Read,Permute) keyword option is what you can use for simple witches of occupation. Run a preliminary calculation and then you can use GaussView to identify the orbitals. GaussView will let you drag electrons between orbitals and then make the input using Guess=(Read,Permute) to switch them in the initial guess. The Guess=Fragment approach is detailed in the white paper above and can be used for more complex cases. Please review these options and let me know if you have more questions. |
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