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fwang2011

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[求助] 请教:算C101H204S2的优化结构,该用什么BASIS

谢谢。
基于下面的简述,STO-3G应该可以的。 3-21G是不是更好?how about 6-31G(d)?



Common Basis Sets
Brief Description of Standard Basis Sets
• Many other sets are in use. Existing sets can be modified
Basis Set Description
STO-3G Minimal basis; qualitative results - large systems
3-21G Double ζ; more accurate results on large systems
6-31G(d) Moderate set; Common use for medium systems
6-31G(d,p) Used where H is site of interest; More accurate
6-31+G(d) Used with anions, excited states, lone pairs, etc.
6-31+G(d,p) Used with anions, etc., where H is site of interest
6-311++G(d,p) Good for final, accurate energies, but expensive
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