Program

O.9 -- Oral, NCTP-40

Date: Tuesday, 28 July 2015

Time: 11h40 - 12h00

Investigating the ionization process of noble gas atoms in a static electric field

Pham Nguyen Thanh Vinh (1)

(1) Ho Chi Minh University of Pedagogy

We investigate the ionization process of noble gas atoms in a static electric field by using Siegert state approach. All the observable quantities of the ionized electrons such as the energy shift, ionization rate, and transverse momentum distribution in the out-going flux can be expressed in term of Siegert states that are the solutions to the stationary Schr\"{o}dinger equation satisfying the regularity and out-going wave boundary conditions. The method is illustrated by calculations of the energy, ionization width, and transverse momentum distribution as functions of the electric field with arbitrary strength for the outer \textit{p} shells of Ne, Ar, Kr, and Xe. Comparison of the numerical results with the prediction of perturbation theory for the energy, with weak-field asymptotic theory for the ionization rate and transverse momentum distribution is discussed. The failure of these approximation theories for strong electric field underlines the indispensable role of our numerical approach.

Presenter: Pham Nguyen Thanh Vinh