Now showing items 1-5 of 5

  • Dynamics of excited atoms and molecules interacting with external fields 

    Simonsen, Sigrid Ina (The University of Bergen, 2013-08-30)
    This thesis is a theoretical study of the behavior of electrons in atoms and molecules subjected to external electromagnetic fields. Three electronic systems have been central in this work, the atomic and quasimolecular ...
  • Femtosecond-pulse-train ionization of Rydberg wave packets 

    Simonsen, Sigrid Ina; Sørngård, Stian Astad; Førre, Morten; Hansen, Jan Petter (American Physical Society, 2012-10-09)
    We calculate, based on first-order perturbation theory, the total and differential ionization probabilities from a dynamic periodic Rydberg wave packet of a given n-shell exposed to a train of femtosecond laser pulses. ...
  • High-order harmonic generation from graphene: Strong attosecond pulses with arbitrary polarization 

    Sørngård, Stian Astad; Simonsen, Sigrid Ina; Hansen, Jan Petter (American Physical Society, 2013-05-03)
    We explore high-order harmonic generation (HHG) from a graphene sheet exposed to intense femtosecond laser pulses based on the Lewenstein model. It is demonstrated that the HHG cutoff frequency increases with graphene ...
  • Interatom intrashell blockade 

    Sælen, L.; Simonsen, Sigrid Ina; Hansen, Jan Petter (American Physical Society, 2011-01-07)
    We demonstrate a feature of the Rydberg blockade mechanism which occurs between two initially excited circular Rydberg atoms. When both atoms are exposed to weak time-dependent electric fields, it is shown that the ...
  • Long-range interactions and dynamics of excited atoms 

    Simonsen, Sigrid Ina (The University of Bergen, 2010-06-10)
    A study of the dynamics of excited hydrogenic atoms, with emphasis on analytical and numerical calculations of the time-independent and the time-dependent Schrõdinger equation. A short description of Rydberg atoms and their ...