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- W2285756925 abstract "In recent articles [Mishima et al., Phys. Rev. A, 66, 033401(2002); Chao, Phys. Rev. A, 72, 053414 (2005)] it was proposed to use the residue theorem for the exact calculation of the transition amplitude describing strong-field ionization of atomic systems within Keldysh theory. This should avoid the necessity to apply the method of steepest descent (saddle-point approximation). Comparing the results of both approaches for atomic hydrogen a difference by a factor of 2 was found for the 1s, and an even more drastic deviation for the 2s state. Thus it was concluded that the use of the saddle-point approximation is problematic. In this work the deviations are explained and it is shown that the previous conclusion is based on an unjustified neglect of an important contribution occurring in the application of the residue theorem. Furthermore, the applicability of the method of steepest descent for the ionization of Rydberg states is discussed and an improvement of the standard result is suggested that successfully removes the otherwise drastic failure for large principal quantum numbers." @default.
- W2285756925 created "2016-06-24" @default.
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- W2285756925 date "2006-10-05" @default.
- W2285756925 modified "2023-09-26" @default.
- W2285756925 title "Note on the exact Keldysh theory of strong-field ionization: residue method vs saddle-point approximation" @default.
- W2285756925 hasPublicationYear "2006" @default.
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