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Physical Review A

Photoassociation spectroscopy of weakly bound Rb287 molecules near the 5P1/2+5S1/2 threshold by optical Bragg scattering in Bose-Einstein condensates

Khan Sadiq Nawaz, Liangchao Chen, Chengdong Mi, Zengming Meng, Lianghui Huang, Pengjun Wang, Jing Zhang

Published Nov 30, 2020• 3 citations
Publisher

Abstract

We report the high-resolution photoassociation (PA) spectroscopy of a $^{87}\mathrm{Rb}$ Bose-Einstein condensate (BEC) to excited molecular states near the dissociation limit of $5{P}_{1/2}+5{S}_{1/2}$ by optical Bragg scattering. Since the detection of optical Bragg scattering in the BEC has a high signal-noise ratio, we obtain the high-resolution PA spectrum of excited molecular states in the range of $\ifmmode\pm\else\textpm\fi{}1$ GHz near the dissociation limit of $5{P}_{1/2}+5{S}_{1/2}$. We compare the results with the conventional method of trap loss and show that the results agree with each other very well. Many interesting phenomena of excited molecular states are observed, such as light-induced frequency shift and anomalous strong bound molecular lines at the atomic transition from $|F=1\ensuremath{\rangle}$ to $|{F}^{\ensuremath{'}}=2\ensuremath{\rangle}$. The observed excited molecular states in the range of $\ifmmode\pm\else\textpm\fi{}1$ GHz near the dissociation limit of $5{P}_{1/2}+5{S}_{1/2}$ should help to further improve long-range bound-state models near the dissociation limit.

DOI
10.1103/physreva.102.053326

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Photoassociation spectroscopy of weakly bound 87Rb2^{87}Rb_{2}87Rb2​ molecules near 5P1/2+5S1/25P_{1/2} +5S_{1/2}5P1/2​+5S1/2​ threshold by optical Bragg scattering in Bose-Einstein condensates
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We report on the high resolution photoassociation spectroscopy of a 87Rb^{87}\mathrm{Rb}87Rb spin-1 Bose-Einstein condensate to the 1g(P3∕2){1}_{g}({P}_{3∕2})1g​(P3∕2​) v=152v=152v=152 excited molecular states. We demonstrate the use of spin dependent photoassociation to experimentally identify the molecular states and their corresponding initial scattering channel. These identifications are in excellent agreement with the eigenvalues of a hyperfine-rotational Hamiltonian. Using the observed spectra we estimate the change in scattering length and identify photoassociation laser light frequency ranges that maximize the change in the spin-dependent mean-field interaction energy.
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