POLARIZATION OF THE NUCLEAR SPINS OF NOBLE-GAS ATOMS BY SPIN EXCHANGE WITH OPTICALLY PUMPED ALKALI-METAL ATOMS
POLARIZATION OF THE NUCLEAR SPINS OF NOBLE-GAS ATOMS BY SPIN EXCHANGE WITH OPTICALLY PUMPED ALKALI-METAL ATOMS
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DOI：
10.1103/physreva.29.3092
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发表时间：
1984-01-01
影响因子：
2.9
通讯作者：
ZENG, X
中科院分区：
文献类型：
--
作者：
HAPPER, W;MIRON, E;ZENG, X
本文介绍了光泵碱金属原子与惰性气体原子核之间的自旋交换理论。在长寿命的货车德瓦耳斯分子中，与重惰性气体的自旋交换主要由相互作用决定。主要的自旋相互作用为碱金属-稀有气体对的转动角动量N→与碱金属原子的电子自旋S→之间的自旋-转动相互作用γ N→· S→，以及稀有气体原子的核自旋K→与电子自旋S→之间的接触超精细相互作用α K→· S→.假设碱金属原子的K和核自旋I为任意值。给出了自旋转移系数的精确形式表达式，沿着给出了基于（α γ N）2幂的微扰展开式的方便近似。
The theory of spin exchange between optically pumped alkali-metal atoms and noble-gas nuclei is presented. Spin exchange with heavy noble gases is dominated by interactions in long-lived van der Waals molecules. The main spin interactions are assumed to be the spin-rotation interactions γ N→· S→ between the rotational angular momentum N→ of the alkali-metal—noble-gas pair and the electron spin S→ of the alkali-metal atom, and the contact hyperfine interaction α K→· S→ between the nuclear spin K→ of the noble-gas atom and the electron spin S→. Arbitrary values for K and for the nuclear spin I of the alkali-metal atom are assumed. Precise formal expressions for spin transfer coefficients are given along with convenient approximations based on a perturbation expansion in powers of (α γ N) 2, a quantity which has been shown to be small by experiment.