Magnetic tuning of ultracold barrierless chemical reactions
Magnetic tuning of ultracold barrierless chemical reactions
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DOI：
10.1103/physrevresearch.2.013117
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发表时间：
2019-04
影响因子：
4.2
通讯作者：
T. Tscherbul;J. Kłos
中科院分区：
文献类型：
--
作者：
T. Tscherbul;J. Kłos
虽然实现双分子化学反应的外场控制一直是物理和化学领域梦寐以求的目标，但超精细相互作用和直流磁场在实现这种控制中的作用仍然难以捉摸。我们发展了一种扩展的无障原子-硅藻化学反应的耦合通道统计理论，并应用它来解释磁场和超精细相互作用对超冷化学反应Li($^2\text{S}_{1/2}$) + CaH($^2\Sigma^+$) $到$ LiH($^1\Sigma^+$) + Ca（$^1\text{S}_{0}$）在一组新开发的从头算势能面上的影响。我们观察到反应截面上的大场效应，打开了通过外部磁场调节反应物的选定超精细状态来控制超冷无障碍化学反应的可能性。
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.