当前位置: X-MOL 学术Phys. Lett. A › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Circular dichroism in atomic vapors: magnetically induced transitions responsible for two distinct behaviors
Physics Letters A ( IF 2.6 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.physleta.2020.127114
Armen Sargsyan , Arevik Amiryan , Ara Tonoyan , Emmanuel Klinger , David Sarkisyan

Atomic transitions of alkali metals for which the condition $F_e-F_g = \pm2$ is satisfied have null probability in a zero magnetic field, while a giant increase can occur when an external field is applied. Such transitions, often referred to as magnetically-induced (MI) transitions, have received interest because their high probabilities in wide ranges of external magnetic fields which, in some cases, are even higher than that of usual atomic transitions. Previously, the following rule was established: the intensities of MI transitions with $\Delta F=\pm2$ are maximum when using respectively $\sigma^\pm$ radiation. Within the same ground state, the difference in intensity for $\sigma^+$ and $\sigma^-$ radiations can be significant, leading to magnetically induced circular dichroism (MCD), referred to as type-1. Here, we show that even among the strongest MI transitions, $i.e$ originating from different ground states for $\sigma^+$ and $\sigma^-$, the probability of MI transition with $\Delta F = + 2$ is always greater, which leads to another type of MCD. Our experiments are performed with a Cs-filled nanocell, where the laser is tuned around the D$_2$ line; similar results are expected with other alkali metals. Theoretical calculations are in excellent agreement with the experimental measurements.

中文翻译:

原子蒸气中的圆二色性:磁感应跃迁导致两种不同的行为

满足条件 $F_e-F_g = \pm2$ 的碱金属的原子跃迁在零磁场中的概率为零,而在施加外场时可能会发生巨大的增加。这种跃迁通常被称为磁感应 (MI) 跃迁,因为它们在大范围的外部磁场中的概率很高,在某些情况下,甚至比通常的原子跃迁还要高。以前,建立了以下规则:分别使用 $\sigma^\pm$ 辐射时,$\Delta F=\pm2$ 的 MI 跃迁强度最大。在相同的基态内,$\sigma^+$ 和 $\sigma^-$ 辐射的强度差异可能很大,导致磁感应圆二色性 (MCD),称为类型 1。这里,我们表明,即使在最强的 MI 转换中,$\sigma^+$ 和 $\sigma^-$ 源自不同的基态,$\Delta F = + 2$ 的 MI 转换概率总是更大,这导致了另一种类型的 MCD。我们的实验是使用 Cs 填充的纳米电池进行的,其中激光围绕 D$_2$ 线进行调谐;其他碱金属也有类似的结果。理论计算与实验测量非常吻合。
更新日期:2021-02-01
down
wechat
bug