空间非均匀激光场驱动的原子非次序双电离

利用三维经典系综模型,研究空间非均匀激光场驱动的氙原子非次序双电离,并对比了空间均匀激光场的情况.结果显示,波长较短时,空间非均匀激光场与空间均匀激光场的非次序双电离的产率较为相近.随着波长的增大,较高激光强度时空间非均匀激光场下非次序双电离受到越来越明显的抑制.相比于空间均匀激光场,空间非均匀激光场下非次序双电离两电子的末态发射角表现出更强烈的关联特性,特别在较大的激光波长下,两电子的末态发射角几乎全部集中在0°附近,这意味着两电子往往是平行发射到相同方向.此外,波长由近红外增大到中红外时,空间非均匀激光场下非次序双电离的有效再碰撞均由第1个电子的第1次返回主导,而空间均匀激光场下则呈现由第1次返回主导到第2次返回主导的转变.进一步,通过反演分析非次序双电离的经典轨迹,揭示了空间非均匀激光场下关联电子超快动力学过程的更多细节.     

Electron dynamics of molecular frustrated double ionization driven by strong laser fields

We theoretically investigate the frustrated double ionization(FDI) of molecules with different alignment-dependence using a three-dimensional classical ensemble method. The numerical results show that the FDI probability decreases with increasing wavelength, which is similar to the wavelength dependence of the FDI probability of atoms. Tracing the classical trajectories reveals that the contributions to molecular FDI from single-recollision and multiple-recollision mechanisms are equal in the sh...