In a 1D three-electron atom, the low-field part of the double-ionization knee is dominated by recollision-excitation after the inner D electron escapes first, followed by field ionization of the excited ion.
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On efficiency of double ionization of a three-electron atom in moderate laser field intensities
In a 1D three-electron atom, the low-field part of the double-ionization knee is dominated by recollision-excitation after the inner D electron escapes first, followed by field ionization of the excited ion.