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Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 1: Cold Molecules 1

MO 1.1: Hauptvortrag

Montag, 17. März 2014, 10:30–11:00, BEBEL HS213

Strongly driven quantum pendulum of a polar molecule — •Sebastian Trippel1, Terence G. Mullins1, Nele L.M. Müller1, Jens S. Kienitz1,2, Rosario González-Férez4, and Jochen Küpper1,2,31Center for Free-Electron Laser Science, DESY, Hamburg — 2Center for Ultrafast Imaging, University of Hamburg — 3Department of Physics, University of Hamburg — 4Instituto Carlos I de Física Teórica y Computacional and Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, Spain

The behavior of molecules subject to strong laser fields has been a rapidly growing topic in molecular physics and chemistry during the last years. The anisotropic interaction between an isolated molecule and a nonresonant, linearly polarized laser field creates pendular states, i. e., directional superpositions of field-free rotational states [1]. We disentangled the rotational and pendular state wavepacket dynamics of quantum state selected carbonyl sulfide (OCS) molecules. A strong oscillation on the degree of alignment is observed that resembles the motion of a classical pendulum. Features in the transition from impulsive, non-adiabatic to adiabatic alignment and orientation were disentangled, with implications on the switching behavior of fast molecular switches in non dissipative media. In addition, we demonstrated how the combination of quantum state selection and rotational coherence spectroscopy allows for a complete measurement of magnitude and polarization of angular momenta of molecules in field-free space.

[1] B. Friedrich and D. Herschbach, Phys. Rev. Lett. 74, 4623 (1995)

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