Opportunities for detecting ring currents using an attoclock setup
Opportunities for detecting ring currents using an attoclock setup
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DOI：
10.1103/physreva.92.063405
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发表时间：
2015-12-07
影响因子：
2.9
通讯作者：
Smirnova, Olga
中科院分区：
文献类型：
--
作者：
Kaushal, Jivesh;Morales, Felipe;Smirnova, Olga
通过圆偏振激光场从具有内部轨道动量的初始状态的强场电离具有有趣的倾向规则：相对于激光场反向旋转的电子比同向旋转的电子更容易被释放[Barth和Smirnova，Phys.Rev.A84，063415（2011）]。在这里，我们表明，几个周期的红外脉冲的应用程序允许一个使用这种倾向规则检测环电流与这样的量子态，通过观察角位移的喷射电子。这种变化是attocock方法的主要观察点。我们用含时解析R矩阵理论证明了从两个反向旋转轨道（p（+）和p（-））出发的电子的attocock测量的角位移是明显不同的。我们的工作为探测原子和分子中激发的环电流提供了机会，使用attocock设置。
Strong field ionization by circularly polarized laser fields from initial states with internal orbital momentum has an interesting propensity rule: electrons counter-rotating with respect to the laser field can be liberated more easily than co-rotating electrons [Barth and Smirnova, Phys. Rev. A 84, 063415 (2011)]. Here we show that application of few-cycle IR pulses allows one to use this propensity rule to detect ring currents associated with such quantum states, by observing angular shifts of the ejected electrons. Such shifts present the main observable of the attoclock method. We use time-dependent analytical R-matrix theory to show that the attoclock measured angular shifts of an electron originating from two counter-rotating orbitals (p(+) and p(-)) are noticeably different. Our work opens opportunities for detecting ring currents excited in atoms and molecules, using the attoclock setup.