Ma Mao-Yun, Wang Jun-Ping, Jing Wen-Quan, Guan Zhong, Jiao Zhi-Hong, Wang Guo-Li, Chen Jian-Hong, Zhao Song-Feng
Opt Express. 2021 Oct 11;29(21):33245-33256. doi: 10.1364/OE.438045.
We theoretically investigate the atomic-orbital-resolved vortex-shaped photoelectron momentum distributions (PMDs) and ionization probabilities by solving the two-dimensional time-dependent Schrödinger equation (2D-TDSE) of neon in a pair of delayed counter-rotating circularly polarized attosecond pulses. We found that the number of spiral arms in vortex patterns is twice the number of absorbed photons when the initial state is the ψ state, which satisfy a change from c to c (n is the number of absorbed photons) rotational symmetry of the vortices if the 2p state is replaced by 2p or 2p states. For two- and three-photon ionization, the magnetic quantum number dependence of ionization probabilities is quite weak. Interestingly, single-photon ionization is preferred when the electron and laser field corotate and ionization probabilities of 2p is much larger than that of 2p if the proper time delay and wavelength are used. The relative ratio of ionization probabilities between 2p and 2p is insensitive to laser peak intensity, which can be controlled by changing the wavelength, time delay, relative phase and amplitude ratio of two attosecond pulses.
我们通过求解氖原子在一对延迟的反向旋转圆偏振阿秒脉冲中的二维含时薛定谔方程（2D - TDSE），从理论上研究了原子轨道分辨的涡旋形光电子动量分布（PMD）和电离概率。我们发现，当初始态为ψ态时，涡旋图案中的螺旋臂数量是吸收光子数量的两倍，如果将2p态替换为2p或2p态，涡旋满足从c到c（n为吸收光子数）的旋转对称性变化。对于双光子和三光子电离，电离概率对磁量子数的依赖性相当弱。有趣的是，当电子与激光场同向旋转时，单光子电离更受青睐，并且如果使用适当的时间延迟和波长，2p的电离概率远大于2p的电离概率。2p和2p之间电离概率的相对比值对激光峰值强度不敏感，可通过改变两个阿秒脉冲的波长、时间延迟、相对相位和振幅比来控制。
