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The emerging field of ultracold molecules with their rich internal structureis currently attracting a lot of interest. Various methods have been developedto produce ultracold molecules in pre-set quantum states. For futureexperiments it will be important to efficiently transfer these molecules fromtheir initial quantum state to other quantum states of interest. Optical Ramanschemes are excellent tools for transfer, but can be involved in terms ofequipment, laser stabilization and finding the right transitions. Here wedemonstrate a very general and simple way for transfer of molecules from onequantum state to a neighboring quantum state with better than 99% efficiency.The scheme is based on Zeeman tuning the molecular state to avoided levelcrossings where radio-frequency transitions can then be carried out. Byrepeating this process at different crossings, molecules can be successivelytransported through a large manifold of quantum states. As an importantspin-off of our experiments, we demonstrate a high-precision spectroscopymethod for investigating level crossings.

Cruising through molecular bound state manifolds with radio frequency