Adiabatic perturbation theory for atoms and molecules in the low frequency regime

TYPESolid State Institute Seminar
Speaker:Ms.Hanna Martiskainen
Affiliation:Department of Physics and the Solid State Institute, Technion
Time:12:30 - 13:30
Location:Solid State Auditorium(Entrance)
Remark:Ph.D Student of Professor Nimrod Moiseyev
  1. The possibility to create extremely short pulses, using high-order harmonics created by a low-frequency
    driving field, has stimulated studies of photo induced dynamics in the low-frequency regime. Using lowfrequency
  2. driver lasers for high-order harmonic generation (HHG) is attractive because the cut-off limit
    scales as one over the laser frequency squared. However, the low frequency raised challenges in dynamics
    calculation in this regime.The multiphoton absorptions by molecules in strong laser fields depend on the
    polarization of the laser and on the molecular structure.
    We represent a perturbational approach for the calculations of the quasi-energy spectrum in the low
    frequency regime, that avoids the construction of the Floquet operator with extremely large number of
    Floquet channels. The zero-order Hamiltonian in our perturbational approach is the adiabatic Hamiltonian
    where the atoms/molecules are exposed to a dc electric field rather than to ac-field. The second order
    perturbation correction terms are obtained when