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Magneto-Optical Trapping of Aluminum Monofluoride
J E Padilla-Castillo1, J Cai1, P Agarwal1
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
Physical Review Letters
|January 2, 2026
Summary
Researchers demonstrate magneto-optical trapping (MOT) of aluminum monofluoride (AlF), a stable molecule. This breakthrough enables new possibilities for precision spectroscopy and narrow-line cooling of molecules.
Area of Science:
- Atomic and Molecular Physics
- Quantum Optics
- Laser Cooling
Background:
- Magneto-optical trapping (MOT) has been limited to molecules with ^{2}Σ electronic ground states.
- These reactive molecules only allow laser cooling from specific rotational levels.
Purpose of the Study:
- To demonstrate magneto-optical trapping (MOT) of aluminum monofluoride (AlF), a stable molecule with a ^{1}Σ^{+} ground state.
- To expand the scope of molecules amenable to laser cooling and precision spectroscopy.
Main Methods:
- Utilized the strong A^{1}Π←X^{1}Σ^{+} transition of AlF near 227.5 nm for MOT.
- Employed rotationally closed Q(J) lines for efficient trapping.
Main Results:
- Achieved MOT of approximately 6×10^{4} AlF molecules for J=1.
- Trapped over 10^{4} molecules for J=2 and J=3 rotational levels.
- Demonstrated potential for trapping at higher rotational levels.
Conclusions:
- AlF is a suitable molecule for magneto-optical trapping, overcoming previous limitations.
- This technique opens doors for precision spectroscopy and narrow-line cooling using AlF's unique transitions.
