Soumia CHqondi - Academia.edu (original) (raw)

Papers by Soumia CHqondi

Copyright © 2013 Abdelkader Makhoute et al. This is an open access article distributed under the ... more Copyright © 2013 Abdelkader Makhoute et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The dynamics of laser-assisted elastic collisions in helium is studied. The formalism which will be developed to de-scribe such laser-assisted collisions, treats the laser-projectile interaction to all orders, while the electron-helium inter-action is treated within the first Born-approximation. Detailed calculations are performed for the elastic scattering of 50 eV electrons by helium accompanied by the transfer of photons. The numerical results show that the good physical in-terpretation of relevant processes needs to consider the maximum of atomic states.

UFR de Physique du Rayonnement et des Interactions Laser-Matière,

International Journal of Innovation and Applied Studies, Jul 2, 2014

The present work aims at analyzing the dynamics of the photoionization process of a hydrogen atom... more The present work aims at analyzing the dynamics of the photoionization process of a hydrogen atom-modelling a single active electron atom-interacting with intense high-frequency laser pulses. The choice of the numerical approach to be used for solving the time-dependent Schrödinger equation (TDSE) of an atom in a laser field is based on the fact that when the intensity of a femtosecond laser get higher, the electron after it reaches the continuum starts behaving as a free electron oscillating in the laser field, which leads to a strong oscillations in the electronic wave function, and then could affect the stability in numerical solutions of TDSE. Therefore a highly stable numerical methods are required for solving the TDSE of an atomic hydrogen in intense laser pulses, for this reason, we chose to use the three-point finite difference method for the spatial discretization of the wave function and the standard Peaceman-Rachford scheme coupled to an inverse iteration procedure for the function's propagation in time. Once the wave function obtained, a spectral analysis of the ejected electron based on the use of a window operator is performed to calculate the probability of ionization of a hydrogen atom by a high frequency laser field.

L'interaction entre un rayonnement laser et un systeme atomique, peut conduire a differents p... more L'interaction entre un rayonnement laser et un systeme atomique, peut conduire a differents processus physiques comme la photoionisation, l'ionisation multiphotonique, l'ionisation tunnel, generation d'harmoniques d'ordres eleves... L'importance de chacun de ces processus est en fait depend de l'intensite et de la frequence du champ laser considere. Ce travail de these a porte sur la description de l'interaction d'un champ laser (Infrarouge et/ou Haute frequence) avec un atome d'hydrogene (archetype d'un systeme a un electron actif). Nous avons tout d'abord developpe les methodes numeriques pour la resolution de l'equation de Schrodinger dependante du temps decrivant le systeme laser-atome d'hydrogene. Ces methodes nous ont permis d'ecrire un code numerique pour la simulation des solutions de cette equation. Nous les avons ensuite utilisees, apres la verification de la convergence de notre programme numerique pour presenter...

TURKISH JOURNAL OF PHYSICS

We present a theoretical study of the main characteristics of two-color photoionization of hydrog... more We present a theoretical study of the main characteristics of two-color photoionization of hydrogen atoms by short strong laser pulses. Our numerical approach is performed by numerically solving the time-dependent Schrödinger equation for a hydrogen atom interacting with Ti:sapphire laser radiation combined with its 15th harmonic. The energy spectra obtained by the direct numerical solution of the Schrödinger equation are compared with those given by the Kroll and Watson perturbative approach. This comparison allows us to check the reliability of the latter approximation.

Optics and Photonics Journal, 2013

The dynamics of laser-assisted elastic collisions in helium is studied. The formalism which will ... more The dynamics of laser-assisted elastic collisions in helium is studied. The formalism which will be developed to describe such laser-assisted collisions, treats the laser-projectile interaction to all orders, while the electron-helium interaction is treated within the first Born-approximation. Detailed calculations are performed for the elastic scattering of 50 eV electrons by helium accompanied by the transfer of photons. The numerical results show that the good physical interpretation of relevant processes needs to consider the maximum of atomic states.

Copyright © 2013 Abdelkader Makhoute et al. This is an open access article distributed under the ... more Copyright © 2013 Abdelkader Makhoute et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The dynamics of laser-assisted elastic collisions in helium is studied. The formalism which will be developed to de-scribe such laser-assisted collisions, treats the laser-projectile interaction to all orders, while the electron-helium inter-action is treated within the first Born-approximation. Detailed calculations are performed for the elastic scattering of 50 eV electrons by helium accompanied by the transfer of photons. The numerical results show that the good physical in-terpretation of relevant processes needs to consider the maximum of atomic states.

UFR de Physique du Rayonnement et des Interactions Laser-Matière,

International Journal of Innovation and Applied Studies, Jul 2, 2014

The present work aims at analyzing the dynamics of the photoionization process of a hydrogen atom... more The present work aims at analyzing the dynamics of the photoionization process of a hydrogen atom-modelling a single active electron atom-interacting with intense high-frequency laser pulses. The choice of the numerical approach to be used for solving the time-dependent Schrödinger equation (TDSE) of an atom in a laser field is based on the fact that when the intensity of a femtosecond laser get higher, the electron after it reaches the continuum starts behaving as a free electron oscillating in the laser field, which leads to a strong oscillations in the electronic wave function, and then could affect the stability in numerical solutions of TDSE. Therefore a highly stable numerical methods are required for solving the TDSE of an atomic hydrogen in intense laser pulses, for this reason, we chose to use the three-point finite difference method for the spatial discretization of the wave function and the standard Peaceman-Rachford scheme coupled to an inverse iteration procedure for the function's propagation in time. Once the wave function obtained, a spectral analysis of the ejected electron based on the use of a window operator is performed to calculate the probability of ionization of a hydrogen atom by a high frequency laser field.

L'interaction entre un rayonnement laser et un systeme atomique, peut conduire a differents p... more L'interaction entre un rayonnement laser et un systeme atomique, peut conduire a differents processus physiques comme la photoionisation, l'ionisation multiphotonique, l'ionisation tunnel, generation d'harmoniques d'ordres eleves... L'importance de chacun de ces processus est en fait depend de l'intensite et de la frequence du champ laser considere. Ce travail de these a porte sur la description de l'interaction d'un champ laser (Infrarouge et/ou Haute frequence) avec un atome d'hydrogene (archetype d'un systeme a un electron actif). Nous avons tout d'abord developpe les methodes numeriques pour la resolution de l'equation de Schrodinger dependante du temps decrivant le systeme laser-atome d'hydrogene. Ces methodes nous ont permis d'ecrire un code numerique pour la simulation des solutions de cette equation. Nous les avons ensuite utilisees, apres la verification de la convergence de notre programme numerique pour presenter...

TURKISH JOURNAL OF PHYSICS

We present a theoretical study of the main characteristics of two-color photoionization of hydrog... more We present a theoretical study of the main characteristics of two-color photoionization of hydrogen atoms by short strong laser pulses. Our numerical approach is performed by numerically solving the time-dependent Schrödinger equation for a hydrogen atom interacting with Ti:sapphire laser radiation combined with its 15th harmonic. The energy spectra obtained by the direct numerical solution of the Schrödinger equation are compared with those given by the Kroll and Watson perturbative approach. This comparison allows us to check the reliability of the latter approximation.

Optics and Photonics Journal, 2013

The dynamics of laser-assisted elastic collisions in helium is studied. The formalism which will ... more The dynamics of laser-assisted elastic collisions in helium is studied. The formalism which will be developed to describe such laser-assisted collisions, treats the laser-projectile interaction to all orders, while the electron-helium interaction is treated within the first Born-approximation. Detailed calculations are performed for the elastic scattering of 50 eV electrons by helium accompanied by the transfer of photons. The numerical results show that the good physical interpretation of relevant processes needs to consider the maximum of atomic states.