Moreover, NLCs are affected by both the spin and the orbital angular momentum of light, providing good material to check the total angular momentum conservation law. 选择液晶是因为它们强烈的双折射提供了一种简单的方法去观察它们绕着激光光轴的旋转。
Recently, theoretical approaches to gas-phase transition-metal chemistry indicated that the reactants, intermediates, and products had different spin multiplicities in ground states. Namely, it did not obey the "spin conservation law". 近年来,人们在研究过渡金属气相反应中发现基态反应物(或中间体)和基态产物有着不同的自旋态。即不遵守自旋守恒定律。