A linear AC trap for polar molecules in their ground state.

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Control and Manipulation
• Physical Chemistry

Background:

• Precise control of cold polar molecules is crucial for fundamental physics studies and quantum technologies.
• Existing trapping methods face limitations in efficiency, loading, and achievable temperatures.
• High-field seeking states of polar molecules offer potential for advanced manipulation.

Purpose of the Study:

• To design, implement, and characterize a novel linear AC trap for polar molecules.
• To investigate the trap's performance, including loading efficiency and confinement capabilities.
• To explore the influence of nonlinear resonance effects on trap dynamics.

Main Methods:

• Experimental implementation of a linear AC trap with optimized geometry for improved access and loading.
• Loading of slow 15ND3 molecules in their ground state from a Stark decelerator.
• Experimental measurements of trap performance dependence on switching frequency and 3D numerical simulations of molecular trajectories.

Main Results:

• The trap successfully captures slow 15ND3 molecules, achieving a temperature of 2.0 mK.
• Measurements reveal characteristic structures due to nonlinear resonance effects as a function of switching frequency.
• Numerical simulations indicate a phase-space acceptance volume of 50 mm³(m/s)³ for the trap.

Conclusions:

• The developed linear AC trap is effective for trapping polar molecules in high-field seeking states.
• The trap's design and operational characteristics, including nonlinear resonance, are well-understood through experimental and theoretical analysis.
• The demonstrated low temperature and significant phase-space acceptance highlight the potential of this trap for future molecular physics research.