Presentation Information
[9p-S5-4]Theoretical analysis of electron-electron interactions in nonsequential double ionization
〇(M1)Ayato Morita1, Shunsuke Sato1 (1.Tohoku Univ.)
Keywords:
Electron dynamics calculation,Nonsequential double ionization,Electron correlation
In this study, we investigate the non-sequential double ionization (NSDI) process driven by high-intensity lasers by solving the time-dependent Schrödinger equation for a one-dimensional helium model. Conventionally, NSDI is explained by a recollision model, where the first ionized electron returns to collide with the parent ion. We reexamine this picture using exact calculations and a model that partially ignores electron-electron interactions. Both calculations show a significant enhancement in the double ionization yield compared to the sequential picture. Crucially, because this enhancement is observed even in the partial-interaction model—which inherently excludes the recollision effects—our results demonstrate that the conventional recollision picture cannot fully explain this phenomenon. This suggests the existence of an alternative ionization pathway. In this presentation, we will discuss the role of electron-electron interactions in this NSDI process.