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- W2057202430 startingPage "015303" @default.
- W2057202430 abstract "The relationship between the length gauge (LG) and the velocity gauge (VG) exact forms of the photoionization probability amplitude is considered. Our motivation for this paper comes from applications of the Keldysh?Faisal?Reiss (KFR) theory, which describes atoms (or ions) in a strong laser field (in the nonrelativistic approach, in the dipole approximation). On the faith of a certain widely-accepted assumption, we present a simple proof that the well-known LG form of the exact photoionization (or photodetachment) probability amplitude is indeed the gauge-invariant result. In contrast, to obtain the VG form of this probability amplitude, one has to either (i) neglect the well-known G?ppert-Mayer exponential factor (which assures gauge invariance) during all the time evolution of the ionized electron or (ii) put some conditions on the vector potential of the laser field." @default.
- W2057202430 created "2016-06-24" @default.
- W2057202430 creator A5040833011 @default.
- W2057202430 date "2007-12-12" @default.
- W2057202430 modified "2023-09-27" @default.
- W2057202430 title "Simple proof of gauge invariance for theS-matrix element of strong-field photoionization" @default.
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- W2057202430 doi "https://doi.org/10.1088/0031-8949/77/01/015303" @default.
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