Abstract
We present the complex absorbing potential (CAP) method to investigate theStarkeffect in hydrogen and lithium. The numerical technique as applied tocalculations of Stark shifts and widths yields an appealing, simple andpowerful tool for the computation of resonance parameters of thescatteringprocesses. The feasibility and accuracy of the present method aredemonstrated by the numerical evidence of the Stark shifts and widths ofHatom ground and excited states. The results agree satisfactorily with theavailable results in the literature. Moreover, the method providesunambiguous advantages over other existing methods forthe calculationofresonance parameters in a many-electron system and is illustrated for thelow-lying states of the Li atom under the influence of external DCelectric fields. Some new results are reported.
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