核自旋对化学反应的影响：磁同位素和磁场效应（综述）。
Influence of nuclear spin on chemical reactions: Magnetic isotope and magnetic field effects (A Review).
机构信息
Department of Chemistry, Columbia University, New York, New York 10027.
出版信息
Proc Natl Acad Sci U S A. 1983 Jan;80(2):609-21. doi: 10.1073/pnas.80.2.609.
The course of chemical reactions involving radical pairs may depend on occurrence and orientation of nuclear spins in the pairs. The influence of nuclear spins is maximized when the radical pairs are confined to a space that serves as a cage that allows a certain degree of independent diffusional and rotational motion of the partners of the pair but that also encourages reencounters of the partners within a period which allows the nuclear spins to operate on the odd electron spins of the pair. Under the proper conditions, the nuclear spins can induce intersystem crossing between triplet and singlet states of radical pairs. It is shown that this dependence of intersystem crossing on nuclear spin leads to a magnetic isotope effect on the chemistry of radical pairs which provides a means of separating isotopes on the basis of nuclear spins rather than nuclear masses and also leads to a magnetic field effect on the chemistry of radical pairs which provides a means of influencing the course of polymerization by the application of weak magnetic fields.
涉及自由基对的化学反应过程可能取决于对中核自旋的发生和取向。当自由基对被限制在一个空间中时，核自旋的影响最大，这个空间充当一个笼子，允许对的伙伴在一定程度上进行独立的扩散和旋转运动，但也鼓励对在允许核自旋作用于对的奇数电子自旋的时间内重新相遇。在适当的条件下，核自旋可以诱导自由基对的三重态和单重态之间的系间窜越。结果表明，这种系间窜越对核自旋的依赖导致自由基对化学的磁同位素效应，这为基于核自旋而不是核质量分离同位素提供了一种手段，并且还导致自由基对化学的磁场效应，这为通过施加弱磁场来影响聚合过程提供了一种手段。
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