Deviation from Universality in Collisions of Ultracold Li-6(2) Molecules

作者：Wang Tout T^*; Heo Myoung Sun; Rvachov Timur M; Cotta Dylan A; Ketterle Wolfgang

来源：Physical Review Letters, 2013, 110(17): 173203.

DOI：10.1103/PhysRevLett.110.173203

Collisions of Li-6(2) molecules with free Li-6 atoms reveal a striking deviation from universal predictions based on long-range van der Waals interactions. Li-2 closed-channel molecules are formed in the highest vibrational state near a narrow Feshbach resonance and decay via two-body collisions with Li-2, Li, and Na. For Li-2 + Li-2 and Li-2 + Na, the decay rates agree with the universal predictions of the quantum Langevin model. In contrast, the rate for Li-2 + Li is exceptionally small, with an upper bound 10 times smaller than the universal prediction. This can be explained by the low density of available decay states in systems of light atoms [G. Quemener, J.-M. Launay, and P. Honvault, Phys. Rev. A 75, 050701 (2007)], for which such collisions have not been studied before. DOI: 10.1103/PhysRevLett.110.173203

• 出版日期2013-4-25