Non-dipole and relativistic effects on above threshold ionisation of one electron system in super intense laser field

In this study, above threshold ionization in one-electron system in intense laser field is investigated. Firstly, interaction of one electron system with on electromagnetic field is investigated and the processes particularly ionization, is investigated. Since the interaction occurs in a laser field not only single photon ionization but also multiphoton ionization and above threshold ionization processes are defined. Both later processes depend on the intensity and frequency of the field. At low intensity dipole approximation is valid. Thus, this limit of discussed and non-dipole effects and relativistic effects at higher intensity are investigated within strong field approximation (SFA).