Loss of Ultracold 87Rb133Cs Molecules via Optical Excitation of Long-Lived Two-Body Collision Complexes
Loss of Ultracold 87Rb133Cs Molecules via Optical Excitation of Long-Lived Two-Body Collision Complexes
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DOI：
10.1103/physrevlett.124.163402
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发表时间：
2020-04-23
影响因子：
8.6
通讯作者：
Cornish, Simon L.
中科院分区：
文献类型：
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作者：
Gregory, Philip D.;Blackmore, Jacob A.;Cornish, Simon L.
我们发现，超冷基态（RbCs）-Rb-87-Cs-133分子在光阱中的寿命是有限的长寿命的两体碰撞复合物的快速光激发。我们通过对陷阱强度施加方波调制来部分抑制这种损失机制，使得分子在黑暗中度过每个调制周期的75%。通过改变调制频率，我们表明，在黑暗中的碰撞复合物的寿命为0.53 +/- 0.06毫秒。我们发现，当λ = 1550 nm时，碰撞复合物的光激发速率为3（-2）（+4）× 10（3）W-1 cm（2）s（-1），导致典型陷阱强度的寿命< 100 ns。这些结果解释了在非反应性双碱分子实验中观察到的两体损失。
We show that the lifetime of ultracold ground-state (RbCs)-Rb-87-Cs-133 molecules in an optical trap is limited by fast optical excitation of long-lived two-body collision complexes. We partially suppress this loss mechanism by applying square-wave modulation to the trap intensity, such that themolecules spend 75% of each modulation cycle in the dark. By varying the modulation frequency, we show that the lifetime of the collision complex is 0.53 +/- 0.06 ms in the dark. We find that the rate of optical excitation of the collision complex is 3(-2)(+4) x 10(3) W-1 cm(2) s(-1) for lambda = 1550 nm, leading to a lifetime of < 100 ns for typical trap intensities. These results explain the two-body loss observed in experiments on nonreactive bialkali molecules.