亚稳态氦原子与基态锂原子的自旋态控制化学电离反应
Spin-state-controlled chemi-ionization reactions between metastable helium atoms and ground-state lithium atoms
摘要：
我们证明了控制$^4$ He（2 $^3$ S $_1$）- $^7$ Li（2 $^2$ S $_{1/2}$）化学电离反应的全光学电子自旋态制备的两个原子物种之前的碰撞过程。我们的结果表明，化学电离强烈抑制（增强）的非自旋守恒（自旋守恒）碰撞在热能。这些发现与基于自旋角动量耦合的准分子态原子态的模型是一致的。与模型的小偏差表明$^4Σ^+$通道对违反自旋守恒的反应速率的贡献。
英文摘要：
We demonstrate the control of $^4$He(2$^3$S$_1$)-$^7$Li(2$^2$S$_{1/2}$) chemi-ionization reactions by all-optical electron-spin-state preparation of both atomic species prior to the collision process. Our results demonstrate that chemi-ionization is strongly suppressed (enhanced) for non-spin-conserving (spin-conserving) collisions at thermal energies. These findings are in good agreement with a model based on spin angular momentum coupling of the prepared atomic states to the quasi-molecular states. Small deviations from the model indicate the contribution of the $^4Σ^+$ channel to the reaction rate which is in violation of spin conservation.
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