Holmegaard, L; Nielsen, JH; Nevo, I; Stapelfeldt, H; Filsinger, F; Küpper, J; Meijer, G; (2009) Laser-induced alignment and orientation of quantum-state-selected large molecules. Physical Review Letters , 102 (2) , Article 023001. 10.1103/PhysRevLett.102.023001.

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Abstract

A strong inhomogeneous static electric field is used to spatially disperse a supersonic beam of polar molecules, according to their quantum state. We show that the molecules residing in the lowest-lying rotational states can be selected and used as targets for further experiments. As an illustration, we demonstrate an unprecedented degree of laser-induced 1D alignment $(<\cos^2\theta_{2D}>=0.97)$ and strong orientation of state-selected iodobenzene molecules. This method should enable experiments on pure samples of polar molecules in their rotational ground state, offering new opportunities in molecular science.

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