Double-electron ionization driven by inhomogeneous fields

Abstract

Electron-electron correlation effects play an instrumental role in our understanding of sequential (SDI) and non-sequential double ionization (NSDI) mechanisms. Here, we present a theoretical study of NSDI driven by plasmonic-enhanced spatial inhomogeneous fields. By numerically solving the time-dependent Schrödinger equation for a linear reduced model of He and a double-electron time-evolution probability analysis, we provide evidence for the enhancement effects in NSDI showing that the double ionization yield at lower laser peak intensities is increased due to the inhomogeneity of the laser field. Furthermore, our quantum mechanical model, as well as classical trajectory Monte Carlo simulations, show that inhomogeneous fields are a useful tool for splitting the binary and recoil processes in the rescattering scenario.

Pulse length effects in long wavelength driven non-sequential double ionization

“…Similar butterfly PMD patterns can also be found with spatially inhomogeneous 800 nm laser fields. These structures can be controlled by the inhomogeneity strength of the plasmonic-enhanced field [28]. However, the ionization dynamics are different between the 800 nm and 3100 nm cases, based on the large difference in their respective recoil energies.…”

Nonsequential double ionization of atoms driven by spatially inhomogeneous laser fields

“…同时, 势能对称性破缺会导致奇次 谐波和偶次谐波同时产生 [23] . 研究还发现强场电 离中的高能结构敏感地依赖于 [24] , 而且关联电子 动量分布与载波包络相位密切相关 [25] . 空间非均 匀激光场驱动下返回的高能电子不仅可能被母核 离子再俘获诱导高次谐波的产生, 也可能与母核离 子发生弹性碰撞诱导阈上电离, 还可能与母核离子 发生非弹性碰撞诱导NSDI.…”