Improved Weisskopf-Wigner approximation for atomic ionization by short laser pulses

29th International Conference on Photonic, Electronic, and Atomic Collisions

Bustamante, M.G.^1 ; Rodríguez, V.D.^1

Departamento de Física, Instituto de Física de Buenos Aires, Argentina^1

关键词: Atomic ionization;    Initial state;    Ionization amplitude;    Numerical solution;    Other discrete;    Short laser pulse;    Volterra integro-differential equations;    Weisskopf-Wigner approximation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/9/092113/pdf
DOI  :  10.1088/1742-6596/635/9/092113

来源: IOP

【 摘 要 】

An improved Weisskopf-Wigner approximation allows to obtain a closed form for the survival amplitude and the ionization amplitudes of atoms subject to laser pulses. The improvement avoids the numerical solution of a Volterra integro-differential equation obtained by modeling full initial state coupling to the continuum as well as transitions between initial state and other discrete states. The calculations are made in the velocity gauge. The improved approximation compares well with a full TDSE numerical solution for Hydrogen.