论文标题
原子过渡中的光学角动量：悖论
Optical angular momentum in atomic transitions: a paradox
论文作者
论文摘要
简单地说明了悖论如下：很明显，光束沿其传播方向的轨道角动量是固有数量，因此在光束中到处都具有相同的值。那么，如何具有零轨道角动量的高斯光束可以驱动（单光子）四极杆跃迁，该横梁需要转移角动量2 $ \ hbar $向吸收原子的转移？
Stated simply the paradox is as follows: it is clear that the orbital angular momentum of a light beam in its direction of propagation is an intrinsic quantity, and therefore has the same value everywhere in the beam. How then can a Gaussian beam, with precisely zero orbital angular momentum, drive a (single-photon) quadrupole transition which requires the transfer of angular momentum 2$\hbar$ to an absorbing atom?
