Collisions between cold molecules in a superconducting magnetic trap,Nature

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Collisions between cold molecules in a superconducting magnetic trap
Nature ( IF 50.5 ) Pub Date : 2019-08-07 , DOI: 10.1038/s41586-019-1446-2
Yair Segev ₁ , Martin Pitzer ₁ , Michael Karpov ₁ , Nitzan Akerman ₁ , Julia Narevicius ₁ , Edvardas Narevicius ₁

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Collisions between cold molecules are essential for studying fundamental aspects of quantum chemistry, and may enable the formation of quantum degenerate molecular matter by evaporative cooling. However, collisions between trapped, naturally occurring molecules have not been directly observed so far owing to the low collision rates of dilute samples. Here we report the direct observation of collisions between cold trapped molecules, without the need for laser cooling. We magnetically capture molecular oxygen in an 800-millikelvin-deep superconducting trap and set bounds on the ratio between the elastic- and inelastic-scattering rates—the key parameter determining the feasibility of evaporative cooling. We further co-trap atoms and molecules and identify collisions between them, paving the way for studies of cold interspecies collisions in a magnetic trap. Collisions between cold trapped molecules are directly observed by magnetically capturing molecular oxygen in a superconducting trap, without the need for laser cooling.

中文翻译：

超导磁阱中冷分子之间的碰撞

冷分子之间的碰撞对于研究量子化学的基本方面至关重要，并且可以通过蒸发冷却形成量子简并分子物质。然而，由于稀释样品的低碰撞率，到目前为止还没有直接观察到被捕获的天然分子之间的碰撞。在这里，我们报告了对冷捕获分子之间碰撞的直接观察，而无需激光冷却。我们在一个 800 毫里克尔文深的超导陷阱中磁性捕获分子氧，并设定弹性和非弹性散射率之间的比率界限——这是决定蒸发冷却可行性的关键参数。我们进一步共同捕获原子和分子并识别它们之间的碰撞，为研究磁阱中的冷种间碰撞铺平了道路。通过磁性捕获超导陷阱中的分子氧，可以直接观察到冷捕获分子之间的碰撞，而无需激光冷却。

更新日期：2019-08-07

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