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Loss of ultracold RbCs molecules via optical excitation of long-lived two-body collision complexes (2002.04431v2)

Published 7 Feb 2020 in physics.atom-ph and cond-mat.quant-gas

Abstract: 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 $0.53\pm0.06$ ms in the dark. We find that the rate of optical excitation of the collision complex is $3{+4}_{-2}\times10{3}$ 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.

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