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Russian Physics Journal

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

Elena Vladimirovna Koryukina

Published Mar 1, 2016• 1 citation
Publisher
DOI
10.1007/s11182-016-0683-1

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In the present work, the influence of an alternating circularly polarized electric field on the energy spectrum of the He atom is studied. The calculations are performed by the method of the energy matrix diagonalization of an atom in the electric field. This method has allowed us to study the behaviour of the helium energy spectrum from the same numerical procedure under resonant and non-resonant excitations by the electric field. Based on the calculation results, we have found that the resonance effects take place not only in the vicinity of resonance, but they influence the shift directions of the Stark states even under non-resonant excitation. Additionally, we have established that the helium energy spectrum behaves consistently in the electric field. The results obtained have allowed us to clarify mechanisms of the influence of the resonance effects on the radiative characteristics of helium plasma.
Atomic absorption spectra of the He I plasma in the static magnetic field in the absence of laser radiation are different from spectra in the presence of laser radiation. Especially, it has been theoretically predicted that the spectral shift of the satellite line, which is seen in the latter case, does not exist in the former case. In this paper, the effect of three-dimensional high-frequency electric fields on the σ+, σ−, and π components of the allowed 1 1S0-3 1P1 transition and the forbidden 1 1S0-3 1D2 lines in atomic absorption spectra of the He I plasma in a static magnetic field in the absence of a laser beam is investigated from the coupled equations for the probability amplitudes of atomic states. It is shown that they should give rise to a spectral shift of the allowed lines and satellites about forbidden lines. The calculation reveals that the shift is proportional to the mean-square stochastic electric field, and that the ratio of the intensity of the near satellite to that of the far satellite is different from the ratio obtained by the second-order perturbation theory or the three-level rotating-wave approximation. Discussion is given for the validity of this theory.
The spectral line profiles of helium atoms in laser fields are simulated within the framework of the method based on the numerical solution of the non-stationary Schrödinger equation. The proposed method is free from limitations of perturbation theory and makes it possible to calculate the emission spectra of atoms both under non-resonant and resonant excitation by the electric field. The algorithm of this method is implemented in the StarkD software package written in FORTRAN and Maple. Within the framework of the proposed method, the behavior of the helium spectral line profiles is studied under changing electric field frequency in the range of 105 – 107 MHz, which is typical of lasers. A comparative analysis of the behavior of the helium spectral line profiles in resonances and interresonance regions is carried out. Practical applications of the obtained theoretical results are proposed.