Bernard Piraux

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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)
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)
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)
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)
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)
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)
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)