Abstract
By using the region-splitting consistent and iterative method, we calculate therecurrence spectra of lithium atoms in parallel strong external electric andmagnetic fields, and obtain the novel resonance structure in the photoabsorptionspectrum above the ionization threshold with a constant scaled electric field atF̃ = 0.036, and a scaled energy at ε = 0.58 and ε = 0.006, respectively. The results are compared withthose of hydrogen obtained by using standard closed orbit theory. It isdemonstrated that the core-scattered effects exhibited in combinationrecurrence play a great role.
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