Table 2. Error in the DFT Ground State Energy of the Beryllium Atom Computed Using the VWN Functional and Various Values of the Parameter a and Plane Wave Energy Cutoff Ecut.
| a | Ecut (kRy) | ΔE (μHa) |
|---|---|---|
| 4 | 10 | 26 |
| 6 | 16 | 11 |
| 8 | 30 | 3.4 |
| 10 | 38 | 1.5 |
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