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The complex-scaled (r{→}re^iθ) Stark Hamiltonian of hydrogen is diagonalized with a B-spline basis. Accurate complex energies of low-lying resonances are obtained for a wide range of electric-field strength (from 0.03 to 2.0 a.u.). The high accuracy is attributed to the good stationarity behavior of {θ} trajectories with a well-adjusted B-spline basis.
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Rao et al. (1994) studied this question.
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