Magnetic tuning of ultracold barrierless chemical reactions

Abstract

While attaining external field control of bimolecular chemical reactions has long been a coveted goal of physics and chemistry, the role of hyperfine interactions and dc magnetic fields in achieving such control has remained elusive. We develop an extended coupled-channel statistical theory of barrierless atom-diatom chemical reactions, and apply it to elucidate the effects of magnetic fields and hyperfine interactions on the ultracold chemical reaction Li(${}^2{\text{S}}_{1/2}$) + CaH(${}^2{\Sigma }^{+}$) $\to$ LiH(${}^1{\Sigma }^{+}$) + Ca(${}^1{\text{S}}_0$) on a newly developed set of ab initio potential energy surfaces. We observe large field effects on the reaction cross sections, opening up the possibility of controlling ultracold barrierless chemical reactions by tuning selected hyperfine states of the reactants with an external magnetic field.

arXiv comment4.2 pages plus Supplemental Material

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Cited by in corpus (11)

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• Stereodynamic control of cold rotationally inelastic CO + HD collisions
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• Ultracold collisions of the lithium monoxide radical
• A model for nuclear spin product-state distributions of ultracold chemical reactions in magnetic fields
• Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling