Our measured Cu I Stark FWHM (<em>W_m</em>) obtained at 18 400 K electron temperature at 6.3 <b>×</b>

<b>Table 3.</b> Our measured Cu I Stark FWHM (<em>W_m</em>) obtained at 18 400 K electron temperature at 6.3 <b>×</b> 10²² m⁻³ electron density. Transitions and wavelengths are taken from [25]. The accuracy estimates are: 20% ≤ B ≤25% ≤ C ≤30%. <strong>Abstract</strong> In this work we present the Stark widths (<em>W</em>) 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 <b>×</b> 10²² m⁻³ and 2.1 <b>×</b> 10²³ 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', 4s²–4p'' and 4p'–4d' transitions while Cu II spectral lines belong to the 4s–4p, 4p–5s, 4p–4d, 4p–4s², 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.