Resonant collisional shielding of reactive molecules using electric fields
Resonant collisional shielding of reactive molecules using electric fields
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DOI：
10.1126/science.abe7370
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发表时间：
2020-12-11
期刊：
影响因子：
56.9
通讯作者：
Ye, Jun
中科院分区：
文献类型：
--
作者：
Matsuda, Kyle;De Marco, Luigi;Ye, Jun
对分子相互作用的完全控制，包括反应损失，将在量子科学中开辟新的前沿。我们展示了极端的可调谐性的超冷化学反应速率诱导共振偶极相互作用，通过一个外部电场。我们制备了处于第一激发旋转态的费米子钾铷分子，并观察到当我们将电场强度调整百分之几时，化学反应速率的调制为三个数量级。在准二维几何中，我们精确地确定了碰撞的三个主要角动量投影的贡献。利用共振特性，我们屏蔽了分子的损失，并将反应速率抑制在背景值以下一个数量级，从而实现了大电场中极性分子的长寿命样品。
Full control of molecular interactions, including reactive losses, would open new frontiers in quantum science. We demonstrate extreme tunability of ultracold chemical reaction rates by inducing resonant dipolar interactions by means of an external electric field. We prepared fermionic potassium-rubidium molecules in their first excited rotational state and observed a modulation of the chemical reaction rate by three orders of magnitude as we tuned the electric field strength by a few percent across resonance. In a quasi-two-dimensional geometry, we accurately determined the contributions from the three dominant angular momentum projections of the collisions. Using the resonant features, we shielded the molecules from loss and suppressed the reaction rate by an order of magnitude below the background value, thereby realizing a long-lived sample of polar molecules in large electric fields.