Stark broadening in the laser-induced Cu I and Cu II spectra

Abstract

In this work we present the Stark widths (W) of 22 neutral (Cu I) and 100 singly ionized (Cu II) copper spectral lines that have been measured at 18 400 K and 19 300 K electron temperatures and 6.3 × 10 22 m−3 and 2.1 × 10 23 m−3 electron densities, respectively. The experiment is conducted in the laser-induced plasma—the Nd:YAG laser, operating at 532 nm, was used to produce plasma from the copper sample in the residual air atmosphere at a pressure of 8 Pa. The electron temperature and density were estimated by the Boltzmann-plot method and from the Saha equation. The investigated Cu I lines belong to the 4s–4p′, 4s 2–4p″ and 4p′–4d′ transitions while Cu II spectral lines belong to the 4s–4p, 4p–5s, 4p–4d, 4p–4s 2, 4d–4f and 4d–v transitions. Comparison with existing experimental data was possible only in the case of 17 Cu II lines due to a lack of experimental and theoretical values. The rest of the data, Stark widths of 22 Cu I and 83 Cu II lines are published for the first time.

Stark shift measurement as a temperature diagnostic of Cu-dominated thermal plasmas

“…A proper treatment of radiation not only involves solving a radiative transfer equation [9], but also the knowledge of the oscillator strengths and Stark parameters of the optical transitions of the atoms and ions consituting the plasma [10]. Only a few theoretical and experimental Stark shift data have been available for Cu [11][12][13][14][15][16]. Despite the importance of Cu plasmas for switching applications, it is therefore not clear if strong shifts may be expected in the ranges of operating temperatures and pressures, and the importance of accounting for these shifts when treating heat propagation by radiation is questionable.…”

Emission enhancement of femtosecond laser-induced breakdown spectroscopy using vortex beam

“…Under the assumption that the plasma satisfies the local thermal equilibrium (LTE) and optically thin conditions, the Boltzman plot is used to calculate the plasma temperature [34]. The plasma temperature equation is ln( [35][36][37].…”

Division B Commission 14 Working Group: Collision Processes

“…A semi-empirical approach, that uses Hartree-Fock relativistic wave functions and includes core polarization effects, has been applied to 237 Mg III , 6 He I , 3 Mg I and 1 Mg II (Cvejić et al 2013), 1 N I (Bartecka 2014), 4 Al II (Ćirišan et al 2014, 126 Ar II (Djurović et al 2013), 13 Ar II (Gajo et al 2013), 11 Ca II , 26 Fe II (Aguilera et al 2011), 36 Fe II and 27 Ni II , 2 Cu I (Burger et al 2014b), 22 Cu I and 100 Cu II (Skočić et al 2013), 1 Hg I, 19 Hg II, 6 Hg III, and 4 Hg IV (Gavrilov et al 2012), 2 In I (Burger et al 2014a), 4 In III , 53 Ni II (Aragón et al 2013), and 83 Cr II ) spectral lines.…”