Bimolecular Chemistry in the Ultracold Regime

Liu, Yu; Ni, Kang-Kuen

doi:10.1146/annurev-physchem-090419-043244

Bimolecular Chemistry in the Ultracold Regime

Journal Article · 20 April 2022 · Annual Review of Physical Chemistry

DOI:https://doi.org/10.1146/annurev-physchem-090419-043244· OSTI ID:1980851

Liu, Yu ^[1]; Ni, Kang-Kuen ^[2]

Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado, USA,; Department of Physics, University of Colorado, Boulder, Colorado, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA,; Massachusetts Institute of Technology–Harvard Center for Ultracold Atoms, Cambridge, Massachusetts, USA

Advances in atomic, molecular, and optical physics techniques allowed the cooling of simple molecules down to the ultracold regime ([Formula: see text]1 mK) and opened opportunities to study chemical reactions with unprecedented levels of control. This review covers recent developments in studying bimolecular chemistry at ultralow temperatures. We begin with a brief overview of methods for producing, manipulating, and detecting ultracold molecules. We then survey experimental works that exploit the controllability of ultracold molecules to probe and modify their long-range interactions. Further combining the use of physical chemistry techniques such as mass spectrometry and ion imaging significantly improved the detection of ultracold reactions and enabled explorations of their dynamics in the short range. We discuss a series of studies on the reaction KRb + KRb → K₂+ Rb₂initiated below 1 μK, including the direct observation of a long-lived complex, the demonstration of product rotational state control via conserved nuclear spins, and a test of the statistical model using the complete quantum state distribution of the products.

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

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0019020

OSTI ID:: 1980851

Journal Information:: Annual Review of Physical Chemistry, Vol. 73, Issue 1; ISSN 0066-426X

Publisher:: Annual Reviews

Country of Publication:: United States

Language:: English

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