Huang Cheng, Zhong Mingmin, Wu Zhengmao
School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
J Chem Phys. 2016 Jul 28;145(4):044302. doi: 10.1063/1.4959188.
We investigate nonsequential double ionization (NSDI) of molecules by few-cycle laser pulses at the laser intensity of 1.2-1.5 × 10(14) W/cm(2) using the classical ensemble model. The same double-line structure as the lower intensity (1.0 × 10(14) W/cm(2)) is also observed in the correlated electron momentum spectra for 1.2-1.4 × 10(14) W/cm(2). However, in contrast to the lower intensity where NSDI proceeds only through the recollision-induced double excitation with subsequent ionization (RDESI) mechanism, here, the recollision-induced excitation with subsequent ionization (RESI) mechanism has a more significant contribution to NSDI. This indicates that RDESI is not necessary for the formation of the double-line structure and RESI can give rise to the same type of structure independently. Furthermore, we explore the ultrafast dynamics underlying the formation of the double-line structure in RESI.
我们使用经典系综模型，研究了在激光强度为1.2 - 1.5×10¹⁴W/cm²的情况下，少周期激光脉冲对分子的非顺序双电离（NSDI）。在1.2 - 1.4×10¹⁴W/cm²的相关电子动量谱中，也观察到了与较低强度（1.0×10¹⁴W/cm²）相同的双线结构。然而，与较低强度下NSDI仅通过再碰撞诱导双激发随后电离（RDESI）机制进行不同，在这里，再碰撞诱导激发随后电离（RESI）机制对NSDI有更显著的贡献。这表明RDESI对于双线结构的形成不是必需的，并且RESI可以独立地产生相同类型的结构。此外，我们探索了RESI中双线结构形成背后的超快动力学。
