Modelling of the dynamic Stark effect and calculation of the transition probabilities for an Ar atom

Abstract

In this paper, the shift and splitting of the energy levels in the circular polarized alternating electric field were modelled for an Ar atom. Moreover, calculations of the transition probabilities needed for obtaining the spectral line intensities and lifetimes were carried out. An anisotropy of the probabilities for transitions between Stark levels was investigated.

Numerical verification of the theory of nonadiabatic tunnel ionization in strong circularly polarized laser fields

“…[44] for alternating laser fields and Refs. [45][46][47] for circularly polarized and arbitrarily strong laser fields using matrix diagonalization. However, these references do not discuss the shape of laser-dressed orbitals.…”

Nonadiabatic tunneling in circularly polarized laser fields. II. Derivation of formulas

“…Including effects of the long-range Coulomb potential in a standard way [14,15] and including non-adiabatic Coulomb effects [16,17] do not change our conclusions. The Stark shift of the initial state is not included in our analysis, but it can be calculated separately [7,18] and used to correct the field-free ionization potential used in the present calculation.…”

Calculating Spectral Characteristics of the Helium Atom Excited by an Electric Field in Plasma of Current Sheets

“…After the correctness test, the suggested method was used for simulation of the helium spectrum in an alternating electric field in plasma current sheets. The spectrum calculations were performed in the LS coupling scheme with the basis of unperturbed one-electron nl-functions with l = 0-4 and n ≤ 10 using formulas reported in [8,9]. According to the experimental data from [5,7], the parameters of the circularly polarized electric field were chosen in the range ω = 10 3 MHz and F = 0-120 kV/cm.…”

“…In the present work, the method suggested and developed in [8,9] is used to calculate the emission spectrum of the He atom in an alternating circularly polarized electric field. This method called the method of the energy matrix diagonalization of an atom in an electric field is free from limitations of perturbation theory and is applicable in a wide range of the electric field parameters.…”