Using Circular Dichroism to Control Energy Transfer in Multiphoton Ionization
Using Circular Dichroism to Control Energy Transfer in Multiphoton Ionization
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DOI：
10.1103/physrevlett.126.023201
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发表时间：
2021-01-12
影响因子：
8.6
通讯作者：
Fischer, D.
中科院分区：
文献类型：
--
作者：
De Silva, A. H. N. C.;Atri-Schuller, D.;Fischer, D.
手征性在从粒子物理学到生物化学的各种自然现象中引起对称性破缺。我们研究了一个最简单的手性系统，激光激发，定向，有效的单电子锂靶。在光阱中制备了偏振p态的原子，垂直棒m垂直棒= 1，暴露于同向和反向旋转的圆偏振飞秒激光脉冲。对于取向初态激发能附近的场频率，观察到较强的圆二色性，并且光电子能量受到螺旋度相关的奥特勒-汤斯分裂的显着影响。除了它的基本相关性，该系统是适合于创建自旋极化电子脉冲在飞秒时间尺度上的能量分辨率为几毫电子伏的可逆开关。
Chirality causes symmetry breaks in a large variety of natural phenomena ranging from particle physics to biochemistry. We investigate one of the simplest conceivable chiral systems, a laser-excited, oriented, effective one-electron Li target. Prepared in a polarized p state with vertical bar m vertical bar = 1 in an optical trap, the atoms are exposed to co- and counterrotating circularly polarized femtosecond laser pulses. For a field frequency near the excitation energy of the oriented initial state, a strong circular dichroism is observed and the photoelectron energies are significantly affected by the helicity-dependent Autler-Townes splitting. Besides its fundamental relevance, this system is suited to create spin-polarized electron pulses with a reversible switch on a femtosecond timescale at an energy resolution of a few meV.