We show that the lifetime of ultracold ground-state ${}^{87}$Rb${}^{133}$Cs 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 the molecules spend 75% of each modulation cycle in the dark. By varying the modulation frequency, we show that the lifetime of the collision complex is $0.53\pm 0.06$,ms in the dark. We find that the rate of optical excitation of the collision complex is for $\lambda =1550$,nm, leading to a lifetime of

中文翻译：

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通过长寿命两体碰撞复合物的光激发损失超冷87Rb133Cs分子

我们证明了超冷基态的寿命 ${}^{87}$b${}^{133}$光陷阱中的Cs分子受到长寿命两体碰撞复合物的快速光激发的限制。我们通过对陷波强度应用方波调制来部分抑制这种损耗机制，这样分子在黑暗中会花费每个调制周期的75％。通过改变调制频率，我们表明碰撞复合物的寿命为$0.53\pm 0.06$，ms在黑暗中。我们发现碰撞复合物的光激发速率为$\lambda =1550$，nm，导致寿命为