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

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 Tl II 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. (paper)