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Effect of positive-energy orbitals on the configuration-interaction calculation of the H- atom.

We present the theoretical energy eigenvalues of the {sup 1}{ital S} ground state and the ({ital pp}){sup 3}{ital P{ital e}} state of H{sup {minus}} calculated in a simple configuration-interaction procedure, using a finite set of {ital L}{sup 2}-basis functions constructed from one-electron hydrogenic orbitals. The energy corrections, due to the electron-electron interaction between configurations with various combinations of bound (negative-energy) and continuum (positive-energy) orbitals, are examined in detail. In particular, our calculation has shown that the continuum-continuum type of configurations contribute approximately 15% and 13%, respectively, to the electron affinity of the {sup 1}{ital S} ground state and the ({ital pp}){sup 3}{ital P{ital e}} state of H{sup {minus}}. In addition, our calculation has shown that the calculated oscillator strength for the transition from the {sup 1}{ital S} ground state of H{sup {minus}} to the lowest {sup 1}{ital P} Feshbach resonance below the {ital n}=2 threshold is significantly reduced (nearly 30%) by the presence of the continuum-continuum type of configurations in the ground-state wave function.