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arXiv 1012.0593physics.atom-ph
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~ 3 He核自旋交换光抽运效率的一个基本极限

A fundamental limit to the efficiency of spin-exchange optical pumping of 3He nuclei

T. V. Tscherbul, P. Zhang, H. R. Sadeghpour, A. Dalgarno

摘要:

我们建立了一个基本的限制的自旋交换光泵的效率的3 He核与自旋极化的碱金属原子的碰撞。利用精确的从头计算的分子相互作用和散射性质,我们表明,最大的3 He自旋极化,可以实现在自旋交换碰撞与钾(39 K)和银(107 Ag)原子是有限的各向异性超精细相互作用。我们发现,在Ag-He碰撞中自旋交换比K-He碰撞快得多,这表明在自旋交换光抽运实验中使用Ag来提高超极化3 He的产生率是可能的.我们的分析表明,2S原子在冷3 He气体的存在下的陷阱损失率的测量可以用来探测原子-He碰撞中的各向异性自旋交换相互作用。

英文摘要:

We establish the existence of a fundamental limit to the efficiency of spin-exchange optical pumping of 3He nuclei by collisions with spin-polarized alkali-metal atoms. Using accurate ab initio calculations of molecular interactions and scattering properties, we show that the maximum 3He spin polarization that can be achieved in spin-exchange collisions with potassium (39K) and silver (107Ag) atoms is limited by the anisotropic hyperfine interaction. We find that spin exchange in Ag-He collisions occurs much faster than in K-He collisions, suggesting the possibility of using Ag in spin-exchange optical pumping experiments to increase the production rate of hyperpolarized 3He. Our analysis indicates that measurements of trap loss rates of 2S atoms in the presence of cold 3He gas may be used to probe anisotropic spin-exchange interactions in atom-He collisions.

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