论文标题
增强极化转移到特征$Lα$ X射线线附近的非线性Cooper至少两光子电离
Enhanced polarization transfer to the characteristic $Lα$ x-ray lines near the nonlinear Cooper minimum of two-photon ionization
论文作者
论文摘要
已经表明，对于非线性原子电离，圆形极化程度从入射到荧光的转移在库珀最小值处最大（请参阅Phys。Rev.A \ Textbf {100}，011401（R）（R）（2019））。但是，直到现在，在XUV和X射线光子能量下产生和检测圆形光仍然是一个挑战。我们在这里表明，在两光子电离中，线性极化的转移会大大增强，并且可以通过电流自由电子激光器设施轻松检测到通过测量特征$Lα_1$和$Lα_2$线的线性极化程度。提议详细讨论$ 2P_ {3/2} $的两光子电离，以证明所提出的现象，并详细讨论了此类实验的实现。
It has been shown that for nonlinear atomic ionization, transfer of the degree of circular polarization from incident to fluorescence light is maximum at the Cooper minimum (see Phys. Rev. A \textbf{100}, 011401(R) (2019)). Until the present, however, it is still a challenge to produce and detect circularly-polarized light at xuv and x-ray photon energies. We here show, that transfer of linear polarization is strongly enhanced at the Cooper minimum in two-photon ionization and can be readily detected using current free-electron laser facilities by measurements of the degree of linear polarization of the characteristic $Lα_1$ and $Lα_2$ lines. Two-photon ionization of $2p_{3/2}$ electron of tungsten atom is proposed to demonstrate the presented phenomena and realization of such experiment is discussed in detail.
