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伟大的炸雀

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[交流] gaussview结构优化的basis set选择问题

我在做分子结构优化,基本上都是有机分子(CHON),但是在选择basis set的时候有疑问,请问各位这些的选择原则是啥?

第一个选择,比如6-21G, 6-31G,6-31G’,6-311G等,
第二个选择,+和++,
第三个选择,d和p

求各位不吝赐教
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