Signature of charge migration in modulations of double ionization
© 2018 American Physical Society. We present a theoretical investigation of charge migration following strong-field ionization in a multielectron system. We study a model homonuclear molecule with two electrons, each restricted to one dimension (1+1D), interacting with a strong, static electric field. We show that in this system charge migration results from the interplay between multiple ionization channels that overlap in space, creating a coherent electron-hole wave packet in the cation. We also find that, in our case, charge migration following the first ionization manifests as a modulation of the subsequent double-ionization signal. We derive a parametrized semiclassical model from the full multielectron system and we discuss the importance of the choice of cation electronic-structure basis for the efficacy of the semiclassical representation. We use the ab initio solution of the full 1+1D system as a reference for the qualitative and quantitative results of the parametrized semiclassical model. We discuss the extension of our model to long-wavelength time-dependent fields with full-dimension, many-electron targets.
Publication Source (Journal or Book title)
Physical Review A
Mauger, F., Abanador, P., Bruner, A., Sissay, A., Gaarde, M., Lopata, K., & Schafer, K. (2018). Signature of charge migration in modulations of double ionization. Physical Review A, 97 (4) https://doi.org/10.1103/PhysRevA.97.043407