Prospects for sympathetic cooling of molecules in electrostatic, ac and microwave traps

Prospects for sympathetic cooling of molecules in electrostatic, ac and microwave traps
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静电、交流和微波陷阱中分子交感冷却的前景

DOI:
10.1140/epjd/e2011-10719-x
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发表时间:
2011
期刊:
The European Physical Journal D
影响因子:
--
通讯作者:
Tokunaga S
Tokunaga S
中科院分区:
--
文献类型:
--
作者:
Tokunaga S

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我们考虑了被捕获的分子是如何被超冷原子对称冷却的。作为一个原型系统,我们研究了LiH分子与超冷Li原子的共捕获。我们计算了7LiH+7Li分子与初始基态和第一转动激发态分子的弹性和非弹性碰撞截面。然后,我们使用这些截面来模拟静电陷阱、交流电场陷阱和微波陷阱中的交感冷却。在静态陷阱中,我们发现非弹性损耗太大,不适合于冷却该系统。交流和微波陷阱限制了基态分子,因此抑制了非弹性损耗。然而,交流陷阱中的碰撞可以将分子从稳定的轨迹带到不稳定的轨迹,因此交感冷却伴随着陷阱的损失。在微波陷阱中,没有这样的损耗,应该可以进行交感冷却。
We consider how trapped molecules can be sympathetically cooled by ultracold atoms. As a prototypical system, we study LiH molecules co-trapped with ultracold Li atoms. We calculate the elastic and inelastic collision cross sections of7LiH +7Li with the molecules initially in the ground state and in the first rotationally excited state. We then use these cross sections to simulate sympathetic cooling in a static electric trap, an ac electric trap, and a microwave trap. In the static trap we find that inelastic losses are too great for cooling to be feasible for this system. The ac and microwave traps confine ground-state molecules, and so inelastic losses are suppressed. However, collisions in the ac trap can take molecules from stable trajectories to unstable ones and so sympathetic cooling is accompanied by trap loss. In the microwave trap there are no such losses and sympathetic cooling should be possible.
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