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- W2557597438 abstract "Double ionization of a model helium system by intense extreme ultraviolet laser pulses is investigated by solving the time-dependent Schrodinger equation and extracting the photoelectron spectra. Considering a frequency regime where the nonsequential two-photon double ionization is expected to dominate the double ionization process according to the perturbation theory, we identify the sequential and nonsequential mechanisms from the joint energy spectra of two electrons in the strong-field regime. In the nonperturbative regime, we find that sequential multiphoton double ionization shows remarkable peaks in the joint energy spectra and these peaks spread their widths with increasing laser field strength, which is caused by the ac Stark effect. Thus in the strong-field regime, the ac Stark shifts of different ionic states can be observed from the sequential multiphoton features in the joint energy spectra and the signs of the ac Stark shifts can be controlled by the laser frequency. We also find that the nonsequential mechanism dominates double ionization only at low field strengths while the sequential multiphoton mechanism contributes substantially at high field strengths, in accordance with estimates from rate equations." @default.
- W2557597438 created "2016-12-08" @default.
- W2557597438 creator A5009722194 @default.
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- W2557597438 date "2016-11-29" @default.
- W2557597438 modified "2023-09-23" @default.
- W2557597438 title "Sequential and nonsequential double ionization of helium by intense XUV laser pulses: Revealing ac Stark shifts from joint energy spectra" @default.
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- W2557597438 doi "https://doi.org/10.1103/physreva.94.053424" @default.
- W2557597438 hasPublicationYear "2016" @default.
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