Leonid A. Vainshtein

Wavelengths and transition probabilities of satellites to resonance lines of H- and He-like ions

Abstract The wavelengths, radiative transition probabilities, and autoionization rates have been calculated for ions with atomic numbers Z = 4 to 34. Transitions 2p-1s, 2p2l-1s2l, 1s2l-1s2, 1s2p2l-1s22l have been considered. Perturbation theory in 1 Z has been used.

Energy Levels of He- and Li-Like Ions (States 1snl, 1 s2nl with n = 2-5)

The perturbation method for calculating atomic energies by power series in 1/Z and αZ has been extended to include parameters for screening and for expansion in the principal quantum number n. Numerical results are given and compared with observations for 1s nl and 1s2 nl of the helium and lithium isoelectronic sequences.

Dielectronic satellite spectra for highly charged H-like ions (2l′3l″−1s2l, 2l′3l″−1s3l) and He-like ions (1s2l′3l″−1s22l, 1s2l′3l″−1s23l) with Z = 6–33

Abstract The wavelengths, radiative transition probabilities, and autoionization rates have been calculated for transitions 2l′3l″−1s2l, 2l′3l″−1s3l, 2l′3l″−1skl, 1s2l′3l″−1s22l, 1s2l′3l″−1s23l, 1s2l′3l″−1s2kl. Ions with atomic number Z = 6–33 have been considered. Perturbation theory in 1 Z has been used. Relativistic corrections have been taken into account within the framework of the Breit operator.

Comparison of calculated and measured wavelengths of resonance transitions in He-like ions for Z = 16-39

The specified calculation of wavelengths of resonance transitions in He-like ions (Z = 16-39) is compared with the results of the X-ray measurements in the spectra of low-inductance vacuum spark in the present paper. The calculation was made by Z-expansion method in the screening representation with the inclusion of relativistic and radiative effects. The experimental data have been obtained with compensation of the Doppler shift and taking into account the correction caused by the presence of adjoining satellites with n = 3. A slight difference between the theory and the experiment in the region Z = 38, 39 has been found.

Intercombination transitions in Be-like ions

We report here on calculation of probabilities of intercombination transitions

Broadening of Spectral Lines

2s^2

Excitation collision strengths, cross-sections and rate coefficients for O V, Si XI, Fe XXIII and Mo XXXIX by electron impact (1s22s2- 1s22s2p- 1s22p2 transitions)

^1S_0

Cross Sections and Rate Coefficients for Inelastic Electron Collisions with Carbon and Oxygen Ions

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Effect of radiative cascades on intensities of dielectronic satellites to Heα

2s2p