论文标题
冷rubidium的椭圆度依赖性顺序过度锁定电离
Ellipticity-dependent sequential over-barrier ionization of cold rubidium
论文作者
论文摘要
我们对RB $^{n+} $后线离子进行高分辨率测量，以充电状态$ n = 4 $，其中激光冷却的rubidium原子通过椭圆形的极化激光器电离，脉搏持续时间为35 fs，强度为3.3 $ \ times $ 10 $ 10 $^2 $^$^$^15} $^15} $^$^a/c。 （OBI）政权。由于椭圆度从线性到圆极化，后坐力离子的动量分布显示出多带结构。这些条带结构的起源可以通过经典的OBI模型和具有海森贝格潜力的专用经典轨迹蒙特卡洛模拟来定量解释。具体而言，通过对经典轨迹的背面分析，我们揭示了依次释放的电子的电离时间和OBI几何形状，从而解开了带结构的倾斜角度后面的机制。这些结果表明，经典处理可以描述碱原子的强场多电离过程。
We perform high-resolution measurements of momentum distribution on Rb$^{n+}$ recoil ions up to charge state $n=4$, where laser-cooled rubidium atoms are ionized by femtosecond elliptically polarized lasers with the pulse duration of 35 fs and the intensity of 3.3$\times$10$^{15}$ W/cm$^2$ in the over-barrier ionization (OBI) regime. The momentum distributions of the recoil ions are found to exhibit multi-band structures as the ellipticity varies from the linear to circular polarizations. The origin of these band structures can be explained quantitatively by the classical OBI model and dedicated classical trajectory Monte Carlo simulations with Heisenberg potential. Specifically, with back analysis of the classical trajectories, we reveal the ionization time and the OBI geometry of the sequentially released electrons, disentangling the mechanisms behind the tilted angle of the band structures. These results indicate that the classical treatment can describe the strong-field multiple ionization processes of alkali atoms.
