Abstract
A calculation of the energies of H3+ and H3 using MO's approximated as linear combinations of 1 S hydrogenic orbitals is made. The energy of H3+ is found to be −139 kcal. in good agreement with previous calculations and with the prediction of the crude MO method. The energy of H3, however, is higher than the energy of three separated H atoms in disagreement with experiment and the prediction of the crude MO method. The poor form of the second MO is blamed for the discrepancy, different effective nuclear charges being needed for the two MO's, or for different nuclei.

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