Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria.
Phys Rev Lett. 2012 Sep 14;109(11):115302. doi: 10.1103/PhysRevLett.109.115302. Epub 2012 Sep 13.
We report on the creation of ultracold (84)Sr(2) molecules in the electronic ground state. The molecules are formed from atom pairs on sites of an optical lattice using stimulated Raman adiabatic passage (STIRAP). We achieve a transfer efficiency of 30% and obtain 4×10(4) molecules with full control over the external and internal quantum state. STIRAP is performed near the narrow (1)S(0)-(3)P(1) intercombination transition, using a vibrational level of the 1(0(u)(+)) potential as an intermediate state. In preparation of our molecule association scheme, we have determined the binding energies of the last vibrational levels of the 1(0(u)(+)), 1(1(u)) excited-state and the X (1)Σ(g)(+) ground-state potentials. Our work overcomes the previous limitation of STIRAP schemes to systems with magnetic Feshbach resonances, thereby establishing a route that is applicable to many systems beyond alkali-metal dimers.
我们报告了在电子基态中创建超冷 (84)Sr(2) 分子的情况。这些分子是通过使用受激拉曼绝热通道 (STIRAP) 在光学晶格的位点上形成的原子对。我们实现了 30%的转移效率，并获得了 4×10(4)个分子，对外部和内部量子态具有完全的控制。STIRAP 是在狭窄的 (1)S(0)-(3)P(1) 复合跃迁附近进行的，使用 1(0(u)(+)) 势能的一个振动能级作为中间态。在我们的分子缔合方案的准备过程中，我们确定了 1(0(u)(+))、1(1(u)) 激发态和 X (1)Σ(g)(+) 基态势能的最后一个振动能级的结合能。我们的工作克服了 STIRAP 方案以前仅限于具有磁 Feshbach 共振的系统的限制，从而建立了一种适用于许多超越碱金属二聚体的系统的途径。
