Feshbach Resonances in NaLi Molecule and Na Atom Collisions

The opportunities to study quantum chemistry, many-body physics, and quantum information processing with molecules can be uncovered by the ability to manipulate both internal and external states of molecules. ²³Na⁶Li is a fermionic molecule that has weak singlet-triplet mixing making it a suitable system to study the triplet ground state. It is notable for its both non-zero electric and magnetic dipole moments and small two-body scattering rate, as predicted by universal model for cold collision. Additionally, NaLi is the lightest bi-alkali molecule, and the theoretical simulation of collisions is relatively feasible compared to other heavy molecules which makes it a promising benchmark system for theoretical quantum scattering calculations. We have previously seen state dependent collisional loss between NaLi molecules and Na atoms. In case of molecules and atoms both in their upper stretched hyperfine states, more than an order of magnitude lower collisional loss compared to universal limit was observed. We report our recent results on magnetic field dependent collision rate between molecules and Na atoms which is enhanced beyond universal rate at Feshbach resonances due to quantum interference.