basis sets en.wikipedia.org/wiki/Basis_set_%28chemistry%29 6-31G, 6-31G(d), and 6-31G(d,p) en.wikipedia.org/wiki/Basis_set_(chemistry) minimum basis 기저집합 basis set basis set 6-31G(d) basis set basis sets 기저집합 Gaussian-type basis sets CBS 6-31G, 6-31G(d), and 6-31G(d,p) basis set minimum basis aug-cc-pVTZ basis set minimum basis basis sets basis set en.wikipedia.org/wiki/Basis_set_(chemistry) basis set exponents Wikipedia Wikipedia Gaussian basis set