Precision test of statistical dynamics with state-to-state ultracold chemistry

Liu, Yu; Hu, Ming-Guang; Nichols, Matthew A.; Yang, Dongzheng; Xie, Daiqian; Guo, Hua; Ni, Kang-Kuen

doi:10.1038/s41586-021-03459-6

Precision test of statistical dynamics with state-to-state ultracold chemistry

Journal Article · Wed May 19 00:00:00 EDT 2021 · Nature (London)

DOI:https://doi.org/10.1038/s41586-021-03459-6· OSTI ID:1830683

^[1]; ^[2]; ^[2]; ^[3]; Xie, Daiqian ^[3]; ^[4]; ^[2]

Harvard Univ., Cambridge, MA (United States); Harvard-MIT Center for Ultracold Atoms, Cambridge, MA (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Harvard University
Harvard Univ., Cambridge, MA (United States); Harvard-MIT Center for Ultracold Atoms, Cambridge, MA (United States)
Nanjing Univ. (China)
Univ. of New Mexico, Albuquerque, NM (United States)

Chemical reactions represent a class of quantum problems that challenge both the current theoretical understanding and computational capabilities1. Reactions that occur at ultralow temperatures provide an ideal testing ground for quantum chemistry and scattering theories, because they can be experimentally studied with unprecedented control, yet display dynamics that are highly complex. Here we report the full product state distribution for the reaction 2KRb → K₂ + Rb₂. Ultracold preparation of the reactants allows us complete control over their initial quantum degrees of freedom, whereas state-resolved, coincident detection of both products enables the probability of scattering into each of the 57 allowed rotational state-pairs to be measured. Our results show an overall agreement with a state-counting model based on statistical theory, but also reveal several deviating state-pairs. In particular, we observe a strong suppression of population in the state-pair closest to the exoergicity limit as a result of the long-range potential inhibiting the escape of products. Finally, the completeness of our measurements provides a benchmark for quantum dynamics calculations beyond the current state of the art.

View Accepted Manuscript (DOE)

Research Organization:: Harvard Univ., Cambridge, MA (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC); US Army Research Office (ARO)

Grant/Contract Number:: SC0019020

OSTI ID:: 1830683

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7859 Vol. 593; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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