TlII excitation cross-sections in collisions of slow electrons with thallium atoms

Abstract

Excitation of a singly-charged thallium ion in electron collisions with thallium atoms has been studied experimentally. Seventy excitation cross sections have been measured at an exciting electron energy of 30 eV. Ten optical excitation functions (OEFs) have been recorded in the incident electron energy range of 0–200 eV. For seven TlII spectral series, the dependence of excitation cross-sections on the principal quantum numbers of upper levels has been studied. A comparison of findings with data from preceding publications is presented.

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

“…The experiment used the method of extended crossing beams enabling cross-sections of the above-named PbI levels to be studied up to n=13-14. Given that this method has already been afforded detailed discussion in a number of papers (Smirnov 2015(Smirnov , 2016a, we dispense with its detailed description in this study. We will only note the main experimental conditions under carrying out the lead experiment proper.…”

“…The breadth of beam electron energy distribution measured using the delaying potential difference method read 0.9 eV at electron energy of 100 eV, increasing to 1.0 eV at 20 and 200 eV. Special measures taken for minimizing the influence of spatial charge on electron energies are detailed in (Smirnov 2016a). Electron beam current densities across the entire electron energy working range of E=0-200 eV were below 1.0 mA cm −2 .…”

Excitation cross-sections of singly charged Zinc ion in E-Zn collisions

“…Considering that the method of extended crossing beams was discussed extensively in a number of past publications (e.g. [14,15]), it would be unnecessary to describe it in detail in this paper. We will only note some basic conditions concerning to the zinc atom experiment proper.…”

Electron-impact excitation cross-sections for high-lying even levels of the dysprosium atom

“…However, even though the levels investigated in [14] lie rather high (up to E = 40400 cm -1 ), not one belongs to the 4f 10 6s7s configuration whose excitation is studied in this paper. Similar to our preceding experiments, we have used the method of extended crossing beams as described in greater detail in recent publications [16,17]. For that reason we find it superfluous to present details of our experimental method and technique in this paper and will only note some basic conditions pertinent to the dysprosium atom experiment proper.…”