Abstract
We analyse the use of dipole adapted basis (DAB) functions to calculate energy positions and widths of doubly excited states of H- and He. By using DAB functions, classification of doubly excited states follows from simply diagonalizing the Hamiltonian for each channel separately. Our results for H- show that both energies and widths obtained with DAB functions are in good agreement with results of accurate calculations, thus showing that the physics of doubly excited states in H- is essentially controlled by the long range-dipole interaction. On the other hand, the model does not work to describe autoionization lifetimes in He, even qualitatively.
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