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We discuss a method of solving the time dependent Schrödinger equation for atoms with two active electrons in a strong laser field, which we used in a previous paper [ A. Scrinzi and B. Piraux, Phys. Rev. A 56, R13 (1997) ] to calculate ionization, double excitation and harmonic generation in Helium by short laser pulses. The method employs complex scaling… (More)

- Jarosław Bauer, Łukasz Pluciński, Bernard Piraux, Robert Potvliege, Mariusz Gajda, Jacek Krzywiński
- 2001

We study the ionization of hydrogen atoms by an intense pulsed beam of photons with energies of 17 or 50 eV. The work is motivated by the demonstration of the free-electron laser (FEL) action at the DESY Laboratory. The parameters chosen for the incident field are in the regime accessible by the FEL. Ionization yields are obtained within three different… (More)

- L Malegat, Henri Bachau, Bernard Piraux
- 2017

In the last few years, the development of high order harmonic generation sources and free electron lasers delivering ultra-intense and ultra-short VUV-XUV pulses has made it possible to study non linear processes in atoms and molecules on the electronic time scale. The theoretical support required by the ongoing experiments comes notably in the form of… (More)

- Anahit Galstyan, Ochbadrakh Chuluunbaatar, +6 authors Bernard Piraux
- 2016

A. Galstyan, O. Chuluunbaatar, A. Hamido, Yu. V. Popov, F. Mota-Furtado, P. F. O’Mahony, N. Janssens, F. Catoire and B. Piraux Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 2 chemin du cyclotron, Box L7.01.07, B-1348 Louvain-la-Neuve, Belgium Joint Institute for Nuclear Research, Dubna, Russia School of Mathematics and… (More)

- Armelle de Bohan, Bernard Piraux, Lino Ponce, Richard Taïeb, Valérie Véniard, A Maquet
- Physical review letters
- 2002

With the help of a suitably chosen momentum-space analysis, we study some of the basic mechanisms governing the physics of the processes occurring when atoms are submitted to intense infrared laser pulses, with peak intensities 10(14) W cm(-2)</=I(max)</=10(15) W cm(-2). This intensity range is especially interesting because two highly nonlinear atomic… (More)

- Robin Shakeshaft, Bernard Piraux
- 2000

When the Hamiltonian H of a system is represented by a finite matrix H, constructed from a discrete basis with overlap matrix B, the matrix representation G(E) ≡ 1/(EB−H) of the resolvent G(E) = 1/(E − H) covers only one branch of G(E). We show how all branches can be specified by the phase φ of a complex unit of time tφ ≡ t0e. This permits H to be… (More)

We describe an approach of spectral type for numerically integrating the time-dependent Schrödinger equation associated to the interaction of a one active electron atom with an electromagnetic pulsed field whose polarization may be arbitrary. The wave function is represented on a Coulomb-Sturmian basis. The time propagation method is based on a… (More)

- Robin Shakeshaft, Bernard Piraux
- 1999

When the Hamiltonian H of a system is represented by a finite matrix H, constructed from a discrete basis with overlap matrix B, the matrix representation G(E) ≡ 1/(EB−H) of the resolvent G(E) = 1/(E − H) covers only one branch of G(E). We show how all branches can be specified by the phase φ of a complex unit of time tφ ≡ t0e. This permits H to be… (More)

- Bernard Piraux
- 1998

The probability that an atom of hydrogen, initially in the 5g(m = 4) state, survives a 90-fs pulse of 620 nm wavelength is calculated both by direct integration of the time-dependent Schrödinger equation and by a Floquet calculation. The two methods give virtually identical results. The survival probability calculated for a one-electron model of neon, for… (More)

- Mariusz Gajda, Jacek Krzywiński, Łukasz Pluciński, Bernard Piraux
- 2000

The free electron laser (FEL) which is currently under construction at the DESY laboratory should deliver a photon beam in the vacuum ultraviolet (VUV) range. Coherent radiation of the FEL will soon allow for testing of the matter–electromagnetic field interaction under very exotic conditions. In this paper we study the ionization of a hydrogen atom by the… (More)