Open Access
Table 2
Asymptotic atomic energies for the 
molecular ion states.
| Molecular states | Asymptotic atomic states | Energy and error (eV) | ||
|---|---|---|---|---|
| NIST | MRD-CI | Error | ||
 |
He(1s2 1S) + He+(1s2S) | 0.000 | 0.000 | 0.00 |
 |
He+(1s2S) + He(1s2s1S) | 19.820 | 19.801 | 0.019 |
 |
He+(1s 2S) + He(1s2s 3S) | 20.616 | 20.612 | 0.004 |
 |
He+(1s 2S) + He(1s2p 3P°) | 20.964 | 20.980 | 0.016 |
 |
He+(1s 2S) + He(1s2p 1P°) | 21.218 | 21.252 | 0.034 |
 |
He+(1s 2S) + He(1s3s3S) | 22.718 | 22.659 | 0.059 |
 |
He+(1s 2S) + He(1s3s1S) | 22.920 | 22.974 | 0.054 |
 |
He+(1s 2S) + He(1s3p 3P°) | 23.007 | 22.917 | 0.036 |
 |
He+(1s 2S) + He(1s3d3D) | 23.074 | 23.021 | 0.053 |
 |
He+(1s 2S) + He(1s3d 1D) | 23.074 | 23.021 | 0.053 |
 |
He+(1s 2S) + He(1s3p 1P°) | 23.087 | 23.082 | 0.005 |
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