Net Average Molecular Orientation during a Full Rotational Period with Single-Cycle Pulses

Details Net Average Molecular Orientation during a Full Rotational Period with Single-Cycle Pulses Net Average Molecular Orientation during a Full Rotational Period with Single-Cycle Pulses

2011-08-19

arxiv.org/abs/1108.3991v2

Physics

Chemical Physics

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Scientific paper

Although no experimental demonstration exists so far, sub-cycle electromagnetic pulses in the THz regime are considered to be one of the best options to orient molecules, thanks to their time asymmetry. However, large instantaneous orientations can be achieved by time-symmetric single-cycle pulses of zero area. We show that, in this case, interferences among eigenstates of the time propagator give rise to a nonzero time average orientation, over the pulse duration, in spite of the existence of time-inversion parity. We also show that, due to the avoidance of the long-tail requirement, multi-single-cycle-pulse schemes can be designed to obtain a net average orientation over a rotational period.

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