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Relativistic effects in photoionizing a circular Rydberg state in the optical regime

Kjellsson Lindblom, Tor Hugo Iwao; Lindroth, Eva; Førre, Morten; Selstø, Sølve
Journal article, Peer reviewed
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URI
https://hdl.handle.net/11250/2753786
Date
2020
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  • Department of Physics and Technology [1824]
  • Registrations from Cristin [5477]
Original version
Physical Review A (PRA). 2020, 102, 063108   https://doi.org/10.1103/PhysRevA.102.063108
Abstract
We study the photoionization process of a hydrogen atom initially prepared in a circular Rydberg state. The atom is exposed to a two-cycle laser pulse with a central wavelength of 800 nm. Before the atom approaches saturation, at field intensities of the order of 10 17 W / cm 2 , relativistic corrections to the ionization probability are clearly seen. The ionization is predominantly driven by the radiation pressure in the propagation direction of the laser field, not by the electric field. Direct comparisons with the full numerical solution of the time-dependent Dirac equation demonstrate quantitative agreement with a semirelativistic approximation, which is considerably easier to implement.
Publisher
American Physical Society
Journal
Physical Review A (PRA)
Copyright
Copyright 2020 American Physical Society

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