Time-resolved resonant photoionization of He using a time-dependent Feshbach method with ultrashort laser pulses

28th International Conference on Photonic, Electronic and Atomic Collisions

Granados-Castro, C.M.^1 ; Sanz-Vicario, J.L.^1

Grupo de Física Atómica y Molecular, Instituto de Física, Universidad de Antioquia, Medellín, Colombia^1

关键词: Configuration interactions;    Dinger equation;    Energy position;    Feshbach formalism;    Spectral methods;    Temporal formation;    Time dependent;    Two photon ionization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/488/3/032023/pdf
DOI  :  10.1088/1742-6596/488/3/032023

来源: IOP

【 摘 要 】

We study the resonant photoionization of the Helium atom subject to ultrashort laser pulses by using a Feshbach formalism in the time domain. We solve the projected time-dependent Schrödinger equation in terms of a configuration interaction spectral method, with a total wave function expanded with configurations defined within bound-like and scattering-like (P) halfspaces. The method allows for accurate descriptions of both the atomic structure (energy positions and widths) as well as for the resonant photodynamics using ultrashort laser pulses. Special attention is given to the temporal formation of Fano profiles in the one- and two-photon ionization cross sections.