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.
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.
Theoretical investigation of the dependence of the transition probabilities on frequency and strength of an circular polarized electric field was carried out for a Kr atom. The number of regularities in the behaviour of these probabilities were revealed and investigated. It was shown that the transition probabilities for a Kr atom in a high-frequency discharge have cubic-polynomial dependence on the electric field strength. It was found, that an increase in the frequency of the electric field leads to a decrease in the splitting of the spectral lines in the electric field and decreases a sensibility of the transition probabilities to the electric-field strength. An anisotropy of the probabilities for transitions between Stark levels was investigated.
The dipole moment function μ(R) of the X1Σ+ electronic state of LiH molecule for small internuclear separation R has been determined. The calculations were carried out within the framework of the model of a united atom. The wave
functions and energy levels of the united Be atom were calculated by ab initio HF method. The dipole moment function
obtained at R -> 0 has the form μ(R) = AR3. The numeric value of the coefficient A has been obtained. The limits of an
applicability of the united atom approximation for the calculation of the dipole moment of LiH molecule were
determined.
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