State- and molecule-selective rotational control in gas mixtures with a shaped optical centrifuge

TL;DR

This paper presents an all-optical method using a shaped optical centrifuge to selectively control the rotation of different molecules in a gas mixture, enabling separation of their rotational states.

Contribution

It introduces a novel spectral shaping technique for optical centrifuges to achieve molecule-specific rotational excitation in gas mixtures.

Findings

Successfully demonstrated selective rotational excitation of two molecular species.

Achieved separation of molecular rotational states based on tailored laser pulses.

Potential to enhance studies of molecular collisions and reactions.

Abstract

We demonstrate experimentally a method of all-optical selective rotational control in gas mixtures. Using an optical centrifuge - an intense laser pulse whose linear polarization rotates at an accelerated rate, we simultaneously excite two different molecular species to two different rotational frequencies of choice. The new level of control is achieved by shaping the centrifuge spectrum according to the rotational spectra of the centrifuged molecules. The shaped optical centrifuge releases one molecular species earlier than the other, therefore separating their target rotational frequencies and corresponding rotational states. The technique will expand the utility of rotational control in the studies of the effects of molecular rotation on collisions and chemical reactions.