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|---|---|---|---|
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| 1.520(0.01)[3] | n/a | n/a | P. W. Langhoff and M. Karplus, J. Chem. Phys. 53, 233 (1970) |
| 1.470[3] | n/a | n/a | A. Dalgarno and W. D. Davison, Mol. Phys. 13, 479 (1967) |