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arXiv 1003.4026physics.atom-ph
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超冷受限化学速率的电场抑制

Electric field suppression of ultracold confined chemical rates

Goulven Quéméner, John L. Bohn

摘要:

本文研究了一维光晶格中极性分子的超冷碰撞。利用量子散射理论和坐标系变换方法,我们计算了费米子分子的弹性和化学猝灭速率常数。以KRb分子为原型,我们发现零电场下碰撞猝灭速率随约束的增加而增加,但当电场打开时,碰撞猝灭速率被抑制,对于碰撞能量为500 nK的分子,对于实际的分子密度,对于实验可达到的电场和陷阱约束,我们预测KRb分子的寿命为1 s.我们发现弹性淬火碰撞率的比例约为100,这可能足以实现有效的实验蒸发冷却的极性KRb分子。

英文摘要:

We consider ultracold collisions of polar molecules confined in a one dimensional optical lattice. Using a quantum scattering formalism and a frame transformation method, we calculate elastic and chemical quenching rate constants for fermionic molecules. Taking KRb molecules as a prototype, we find that the rate of quenching collisions is enhanced at zero electric field as the confinement is increased, but that this rate is suppressed when the electric field is turned on. For molecules with 500 nK of collision energy, for realistic molecular densities, and for achievable experimental electric fields and trap confinements, we predict lifetimes of KRb molecules of 1 s. We find a ratio of elastic to quenching collision rates of about 100, which may be sufficient to achieve efficient experimental evaporative cooling of polar KRb molecules.

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