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|---|---|---|---|
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| 5.06(0.03)[3] | - | - | P. W. Langhoff and M. Karplus, J. Chem. Phys. 53, 233 (1970) |
| 6.660[3] | - | - | A. Dalgarno and W. D. Davision, Adv. At. Mol. Phys. 2, 1 (1966) |