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MO: Fachverband Molekülphysik
MO 28: Poster: Theory: Molecular Dynamics
MO 28.1: Poster
Thursday, March 17, 2011, 16:00–18:00, P1
Energy transfer among distant quantum systems in spatially shaped laser fields — •Oliver Kühn1, Guennaddi Paramonov1, and Andre Dieter Bandrauk2 — 1Institut für Physik, Universität Rostock, Germany — 2Laboratorie de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Canada
The quantum dynamics of two H atoms with a separation of 5.3 nm excited by ultrashort (tp = 5 fs) and spatially shaped laser pulses is studied by the numerical solution of the non-Born-Oppenheimer time-dependent Schrödinger equation within a 3D model, including the internuclear distance R and the two z coordinates of the electrons. Different types of a spatial laser field envelope are considered which either excite both atoms (A and B) or atom A only. In both cases an efficient energy transfer from atom A to atom B has been found. The ionization of atom B achieved mostly after the end of the laser pulse is close to or even higher than that of atom A. It is shown that with a narrow spatial envelope of the laser field, the underlying mechanisms of the energy transfer from A to B and the ionization of B are the Coulomb attraction of the laser driven electron by the proton of atom B and a short-range Coulomb repulsion of the two electrons when their wave functions significantly overlap in the domain of atom B. In the case of a broad Gaussian spatial envelope of the laser field, the opposite process also occurs with a smaller probability: the energy is transferred from the weakly excited atom B to atom A, and the ionization of atom A is also induced by the electron-electron repulsion in the domain of atom A due to a strong overlap of the electronic wave functions.