Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 1: Cold Molecules 1

MO 1.7: Vortrag

Montag, 17. März 2014, 12:15–12:30, BEBEL HS213

Shedding Far-off Resonant Light on Polar Paramagnetic Molecules — •Ketan Sharma and Bretislav Friedrich — Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany

Interactions with external electric, magnetic or optical fields provide the chief means to manipulate the rotational and translational motion of neutral gas-phase molecules. All such methods rely on the ability to create directional states of molecules as only in said states are the molecular body-fixed multipole moments available in the laboratory frame. A far-off resonant optical field hybridizes and aligns the rotational states of an anisotropic molecule. These states occur as tunneling doublets of opposite parity and are quasi-degenerate at high optical field intensities. For polar molecules, these states can be efficiently coupled either by the electric dipole interaction with a superimposed electrostatic field or by the electric dipole-dipole interaction arising between a pair of polar molecules. Thus, a weak static electric field can orient such molecules projecting up to 90% of the dipole moment on the static field direction. For polar paramagnetic molecules, a superimposed magnetic field causes a further parity-conserving hybridization of the molecule's rotational states, doubling the number of the tunneling doublets by removing the degeneracy arising due to the sign of projection of angular momentum on the collinear field axis. The triple field-combination offers a high efficiency and flexibility in amplifying molecular orientation.