Laser-induced 3D alignment and orientation of quantum-state-selected molecules

TL;DR

This paper demonstrates that selecting molecules in specific rotational states enhances 3D alignment and orientation using combined laser and static electric fields, advancing control over molecular orientation.

Contribution

It introduces a method to improve molecular alignment and orientation by using rotational state selection with static electric fields and laser pulses.

Findings

State-selected molecules show stronger alignment and orientation.

Combined laser and static fields enhance control over molecular orientation.

Method improves precision in molecular manipulation.

Abstract

A strong inhomogeneous static electric field is used to spatially disperse a rotationally cold supersonic beam of 2,6-difluoroiodobenzene molecules according to their rotational quantum state. The molecules in the lowest lying rotational states are selected and used as targets for 3-dimensional alignment and orientation. The alignment is induced in the adiabatic regime with an elliptically polarized, intense laser pulse and the orientation is induced by the combined action of the laser pulse and a weak static electric field. We show that the degree of 3-dimensional alignment and orientation is strongly enhanced when rotationally state-selected molecules, rather than molecules in the original molecular beam, are used as targets.