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Russian Physics Journal

A Theoretical Study of Spectral Line Intensities of the Helium Atom in an Alternating Circular Electric Field

Elena Vladimirovna Koryukina, V. I. Koryukin

Published Apr 1, 2016• 2 citations
Publisher
DOI
10.1007/s11182-016-0703-1

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In this work, a new theoretical approach is suggested for calculating the Stark component intensities of spectral lines in atomic emission spectra in an alternating circularly polarized electric field. In the framework of the proposed approach, regularities in the behaviour of the Stark component intensities in emission spectra of rare gas atoms in the electric field have been revealed. The found regularities have allowed us to clarify mechanisms of increasing intensity of spectral lines and their quenching in the electric field.
A computer simulation of the spectral line profiles of the neon atom in an alternating circularly polarized electric field is carried out. The calculations are performed within the framework of a unified theoretical approach based on the numerical solution of the non-stationary Schrödinger equation. The simulation results make it possible to establish a number of regularities in the behavior of the neon spectral line profiles under changes in the electric field parameters. The resonance effects for the neon spectra in the electric field are investigated.
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.