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Nuclear spins are active in ultracold atom–molecule collisions

https://doi.org/10.1038/s41557-025-01779-y

Tscherbul, TV; Ni, K-K (April 2025, Nature Chemistry)

Free, publicly-accessible full text available April 8, 2026
Multichannel interactions of two atoms in an optical tweezer

https://doi.org/10.1103/PhysRevResearch.2.023108

Hood, J. D.; Yu, Y.; Lin, Y.-W.; Zhang, J. T.; Wang, K.; Liu, L. R.; Gao, B.; Ni, K.-K. (April 2020, Physical Review Research)

Full Text Available
Molecular Assembly of Ground-State Cooled Single Atoms

https://doi.org/10.1103/PhysRevX.9.021039

Liu, L. R.; Hood, J. D.; Yu, Y.; Zhang, J. T.; Wang, K.; Lin, Y.-W.; Rosenband, T.; Ni, K.-K. (May 2019, Physical Review X)

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Motional-ground-state cooling outside the Lamb-Dicke regime

https://doi.org/10.1103/PhysRevA.97.063423

Yu, Y.; Hutzler, N. R.; Zhang, J. T.; Liu, L. R.; Hood, J. D.; Rosenband, T.; Ni, K.-K. (June 2018, Physical Review A)
Building one molecule from a reservoir of two atoms

https://doi.org/10.1126/science.aar7797

Liu, L. R.; Hood, J. D.; Yu, Y.; Zhang, J. T.; Hutzler, N. R.; Rosenband, T.; Ni, K.-K. (May 2018, Science)

Full Text Available
Direct observation of bimolecular reactions of ultracold KRb molecules

https://doi.org/10.1126/science.aay9531

Hu, M. -G.; Liu, Y.; Grimes, D. D.; Lin, Y. -W.; Gheorghe, A. H.; Vexiau, R.; Bouloufa-Maafa, N.; Dulieu, O.; Rosenband, T.; Ni, K. -K. (November 2019, Science)

Femtochemistry techniques have been instrumental in accessing the short time scales necessary to probe transient intermediates in chemical reactions. In this study, we took the contrasting approach of prolonging the lifetime of an intermediate by preparing reactant molecules in their lowest rovibronic quantum state at ultralow temperatures, thereby markedly reducing the number of exit channels accessible upon their mutual collision. Using ionization spectroscopy and velocity-map imaging of a trapped gas of potassium-rubidium (KRb) molecules at a temperature of 500 nanokelvin, we directly observed reactants, intermediates, and products of the reaction⁴⁰K⁸⁷Rb +⁴⁰K⁸⁷Rb → K₂Rb₂* → K₂+ Rb₂. Beyond observation of a long-lived, energy-rich intermediate complex, this technique opens the door to further studies of quantum-state–resolved reaction dynamics in the ultracold regime.
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