Controlling the sense of molecular rotation

Details Controlling the sense of molecular rotation Controlling the sense of molecular rotation

2009-07-30

arxiv.org/abs/0907.5300v1

Physics

Quantum Physics

21 pages, 10 figures, Submitted to the New Journal of Physics for the "coherent control" special issue

Scientific paper

We introduce a new scheme for controlling the sense of molecular rotation. By varying the polarization and the delay between two ultrashort laser pulses, we induce unidirectional molecular rotation, thereby forcing the molecules to rotate clockwise/counterclockwise under field-free conditions. We show that unidirectionally rotating molecules are confined to the plane defined by the two polarization vectors of the pulses, which leads to a permanent anisotropy in the molecular angular distribution. The latter may be useful for controlling collisional cross-sections and optical and kinetic processes in molecular gases. We discuss the application of this control scheme to individual components within a molecular mixture in a selective manner.

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