Molecular Angular Momentum Orientation Using Dressed States Created by Laser Radiation.

Area of Science:

• Quantum mechanics
• Molecular physics
• Laser spectroscopy

Background:

• Controlling molecular orientation is crucial for understanding and manipulating chemical and physical processes.
• Previous methods often lack the precision for complete state selectivity.

Purpose of the Study:

• To demonstrate a novel method for achieving state-selective molecular angular momentum orientation.
• To achieve complete M-state selectivity for precise control over molecular orientation.

Main Methods:

• Utilized dressed states created by a continuous-wave (cw) optical field.
• Employed a combination of left- and right-hand circularly polarized lasers on Li₂ molecules.
• Exploited the dependence of Rabi frequency on the quantum number M.

Main Results:

• Achieved complete M-state selectivity for molecular angular momentum orientation.
• Oriented the rotational angular momentum (R) of Li₂ molecules in a ¹Σ state.
• Spectrally resolved Autler-Townes split M components of total angular momentum (J).

Conclusions:

• The developed technique enables precise, state-selective orientation of molecular angular momentum.
• This method offers new possibilities for controlling molecular behavior in space-fixed frames.