München 2004 – wissenschaftliches Programm

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A: Atomphysik

A 15: Poster 2

A 15.12: Poster

Donnerstag, 25. März 2004, 14:00–16:00, Schellingstr. 3

Optimal control of the molecular orientation by half-cycle pulses — •Jamal Berakdar and Alex Matos-Abiague — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

The orientation of polar linear molecules at low temperatures (<10 K) can be controlled by applying exteral electromagnetic fields. The question addressed in this contribution is that which kind of electromagnetic pluses lead swiftly to maximal molecular orientation that can be sustained for a long time (piscoseconds). As a driving field we consider (finite) trains of half-cycle pulses [1]. Our analysis of the quantum dynamics is based on a simplified model which yields analytical conditions for the parameters of the pulses (number of pulses, strength and time delays). The analytical predictions are largely confirmed by a full numerical time-dependent study of the orientation process for NaI molecules [2]. Including finite temperature effects it turned out that the molecular orientation persists at considerable temperatures ( 10 K).

[1] A. Matos-Abiague and J. Berakdar, Chem. Phys. Lett. 382, 475-480 (2003).

[2] A. Matos-Abiague and J. Berakdar, Phys. Rev. A 68, 0634XX (2003).