• DOI:10.1140/epjd/e2017-70707-8
• Corpus ID: 53352885

Modelling laser-atom interactions in the strong field regime

@article{Galstyan2016ModellingLI,
  title={Modelling laser-atom interactions in the strong field regime},
  author={Alexander Galstyan and Yu. V. Popov and Francisca Mota-Furtado and P. F. O’Mahony and No{\"e}l Janssens and Samuel D. Jenkins and Ochbadrakh Chuluunbaatar and Bernard Piraux},
  journal={The European Physical Journal D},
  year={2016},
  volume={71},
  pages={1-11}
}

• A. Galstyan, Y. Popov, +5 authors B. Piraux
• Published 14 November 2016
• Physics
• The European Physical Journal D

Abstract
We consider the ionisation of atomic hydrogen by a strong infrared field. We extend and study in more depth an existing semi-analytical model. Starting from the time-dependent Schrödinger equation in momentum space and in the velocity gauge we substitute the kernel of the non-local Coulomb potential by a sum of N separable potentials, each of them supporting one hydrogen bound state. This leads to a set of N coupled one-dimensional linear Volterra integral equations to solve. We analyze the gauge problem for the model, the different ways of generating the separable potentials and establish a clear link with the strong field approximation which turns out to be a limiting case of the present model. We calculate electron energy spectra as well as the time evolution of electron wave packets in momentum space. We compare and discuss the results obtained with the model and with the strong field approximation and examine in this context the role of excited states.
Graphical abstract