STO-2G Basis Set
The STO-2G basis set is a linear combination of 2 primitive Gaussian functions. The original coefficients and exponents for first-row and second-row atoms are given as follows.
| STO-2G | α1 | c1 | α2 | c2 |
| 1s | 0.151623 | 0.678914 | 0.851819 | 0.430129 |
| 2s | 0.0974545 | 0.963782 | 0.384244 | 0.0494718 |
| 2p | 0.0974545 | 0.61282 | 0.384244 | 0.511541 |
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