Resonance effects in near-threshold electron-impact excitation of the 143.4 nm line in the Pb+ ion*

Excitation of the 6d 2D → 6p 2Po Radiative Transitions in the Pb+ Ion by Electron Impact

“…Proceeding from the calculated value of the excitation cross-section of 0.44 × 10 -16 cm 2 and the branching ratio 0.8, the absolute value of the emission cross-section of the 6s 2 6d 2 D 3/2 → 6s 2 6p 2 P o 1/2 (λ143.4 nm) transition is found to be (0.35 ± 0.17) × 10 -16 cm 2 (see Table 1). Note that this value is slightly less than that from the work [15] obtained with the use of the Van Regemorter formula [35]. In addition, the branching ratio for the 6s 2 6p 2 P o 1/2 → 6s 2 6d 2 D 3/2 transition was not taken into account in Ref.…”

“…In addition, the branching ratio for the 6s 2 6p 2 P o 1/2 → 6s 2 6d 2 D 3/2 transition was not taken into account in Ref. [15]. The absolute value of the emission cross-section for the 6s 2 6d 2 D 5/2 → 6s 2 6p 2 P o 3/2 (λ182.2 nm) transition is determined on account of the experimentally observed ratio of the line intensities I 143.4 /I 182.2 ≈ 1.8 (at 100 eV) and is found to be (0.19 ± 0.09) × 10 -16 cm 2 (see Table 1).…”

“…For the ions of group III, there are experimental investigations of the electron excitation of the Ga + [9], In + [10,11], and Tl + [12] ions as well as theoretical calculations of the excitation cross-sections for the Al + [13] and In + [14] ions. As for the data on electron-impact excitation of the metal ions of group IV, they are very poor, and are presented, to our knowledge, with only one experimental [15] and one theoretical [16] study for the electron-impact excitation of singly charged lead. The radiation constants for this ion are of great interest in recent years since spectral lines of the Pb + ion have been detected in several stars, including Ap and Am stars, as well as in the interstellar medium [17,18].…”

Many particle spectroscopy of atoms, molecules, clusters and surfaces: international conference MPS-2016

“…Paper [48] describes an experiment to measure the effective cross section for the electron excitation of the Pb + resonance 143.4 nm line, in the near threshold energy region. These are the first data regarding the excitation cross-sections at the interaction of electrons with Pb + ions.…”