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Quantum coherent control of the lifetime of excited resonance states with laser pulses

AutorGarcía Vela, Alberto
Fecha de publicación9-sep-2012
EditorCSIC - Instituto de Física Fundamental (IFF)
ResumenThis work explores how to exploit the mechanism of quantum interference occurring between overlapping resonances within a system [1,2] in order to modify and control the lifetime of a specific excited resonance. The system chosen is the Br2(B,v’)-Ne van der Waals (vdW) cluster, since there has been previously shown [3,4] that it presents a range of initial v’ vibrational manifolds for which the ground vdW resonance overlaps with other resonances near in energy corresponding to the v’-1 vibrational manifold (Fig. 1). Thus, modification and control of the predissociation lifetime of the ground vdW resonance of Br2(B,v’)-Ne is investigated through exact wave packet simulations by creating coherent superpositions of v’ and v’-1 overlapping resonances, following two different control schemes. In one of them the system is excited with a single laser pulse of varying width in order to change the population of the different overlapping resonances in the superposition [5]. Two different vibrational states v’ are studied corresponding to the isolated (nonoverlapping) resonance regime, v’=16, and the sparse overlapping resonance regime, v’=27 (see Fig. 1). The effect of changing the excitation energy (i.e., the center of the wave packet prepared) along the excitation spectrum of the v’ ground resonance excited (Fig. 2) is also explored as an additional control parameter. In the second control scheme [6] two laser pulses are used to excite two overlapping resonances, one being the ground resonance of Br2(B,v’=27)-Ne, and the other one being an orbiting resonance in the v=v’-1 manifold. The delay time and the ratio of intensities between the two excitation pulses are used as control parameters.
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