Electron impact excitation cross sections of 1 F o levels of the strontium atom

Abstract

539.186The behavior of excitation cross sections of the strontium atom was studied experimentally in the spectral series 5s4d 1 D 2 -5snf 1 F 3 o in the range n = 4-26, and also the optical excitation functions for lines in the same series in the range n = 4-12. It was established that the beginning of the series is perturbed. The effect of the perturbation is manifested both in the irregular course of the dependence of the absolute values of the cross sections on n, and in the difference between the shapes of the optical excitation functions for different terms of the series. The results obtained are compared with available experimental data.

Empirical regularities in the excitation cross-section behavior of the lead atom (transitions from energy levels of 6pndconfigurations)

“…In the case of the calcium atom (Kuchenev and Smirnov 1995), findings have been presented for five singlet series up to n=23 and ten triplet series up to n=11, the study covering both perturbed and unperturbed series. For the strontium atom, the most detailed results have been obtained in the range n=5-23 (Smirnov 2001a) for 1 D perturbed series and n=4-26 for 1 F°also perturbed series (Smirnov 2007) as well as n=4-18 for 3 F°unperturbed series (Smirnov 2002b). Contrasted with other researcher's data cited above, these findings support the conclusion that the method of extended crossing beams is a dramatic improvement in terms of the amount of data collected on electron-impact excitation crosssections together with a much wider scope of subjects and processes now accessible to the researcher.…”