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摘要
We apply a fundamental definition of time delay, as the difference between the time a particle spends within a finite region of a potential and the time a free particle spends in the same region, to determine results for photoionization of an electron by an extreme ultraviolet laser field using numerical simulations on a grid. Our numerical results are in good agreement with those of the Wigner-Smith time delay, obtained as the derivative of the phase shift of the scattering wave packet with respect to its energy, for the short-range Yukawa potential. In the case of the Coulomb potential we obtain time delays for any finite region, while-as expected-the results do not converge as the size of the region increases towards infinity. The impact of an ultrashort near-infrared probe pulse on the time delay introduced here is analyzed for both the Yukawa and the Coulomb potential and is found to be small for intensities below 10(13) W/cm(2). DOI: 10.1103/PhysRevA.87.033420
- 出版日期2013-3-27
