Altaf Adeel, Dutta Sourav, Lorenz John, Pérez-Ríos Jesús, Chen Yong P, Elliott D S
Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
J Chem Phys. 2015 Mar 21;142(11):114310. doi: 10.1063/1.4914917.
We report the formation of ultracold (7)Li(85)Rb molecules in the a(3)Σ(+) electronic state by photoassociation (PA) and their detection via resonantly enhanced multiphoton ionization (REMPI). With our dual-species Li and Rb magneto-optical trap apparatus, we detect PA resonances with binding energies up to ∼62 cm(-1) below the (7)Li 2s (2)S1/2 + (85)Rb 5p (2)P1/2 asymptote. In addition, we use REMPI spectroscopy to probe the a(3)Σ(+) state and excited electronic 3(3)Π and 4(3)Σ(+) states and identify a(3)Σ(+) (v″ = 7-13), 3(3)Π (vΠ' = 0-10), and 4(3)Σ(+) (vΣ' = 0-5) vibrational levels. Our line assignments agree well with ab initio calculations. These preliminary spectroscopic studies on previously unobserved electronic states are crucial to discovering transition pathways for transferring ultracold LiRb molecules created via PA to deeply bound rovibrational levels of the electronic ground state.
我们报告了通过光缔合（PA）形成处于a(3)Σ(+)电子态的超冷(7)Li(85)Rb分子，并通过共振增强多光子电离（REMPI）对其进行检测。利用我们的双物种Li和Rb磁光阱装置，我们检测到了结合能高达比(7)Li 2s (2)S1/2 + (85)Rb 5p (2)P1/2渐近线低约62 cm(-1)的PA共振。此外，我们使用REMPI光谱探测a(3)Σ(+)态以及激发电子态3(3)Π和4(3)Σ(+)，并确定了a(3)Σ(+)（v″ = 7 - 13）、3(3)Π（vΠ' = 0 - 10）和4(3)Σ(+)（vΣ' = 0 - 5）的振动态。我们的谱线归属与从头算计算结果吻合良好。这些对以前未观测到的电子态的初步光谱研究对于发现将通过PA产生的超冷LiRb分子转移到电子基态的深束缚振转能级的跃迁途径至关重要。
