Experimental profiles of the 240.01 nm (4s–4p transition) and 240.33 nm (4p–5s transition) Cu II spectral lines fitted to the Voigt profile, convolution of the Lorentz and Gauss function, using a value of 4.4 pm as the Gaussian parameter

<p><strong>Figure 5.</strong> Experimental profiles of the 240.01 nm (4s–4p transition) and 240.33 nm (4p–5s transition) Cu II spectral lines fitted to the Voigt profile, convolution of the Lorentz and Gauss function, using a value of 4.4 pm as the Gaussian parameter. The quoted FWHM values are sums of the Stark, Doppler and instrumental contribution to the line width.</p> <p><strong>Abstract</strong></p> <p>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> 10<sup> 22</sup> m<sup>−3</sup> and 2.1 <b>×</b> 10<sup> 23</sup> m<sup>−3</sup> 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<sup> 2</sup>–4p'' and 4p'–4d' transitions while Cu II spectral lines belong to the 4s–4p, 4p–5s, 4p–4d, 4p–4s<sup> 2</sup>, 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.</p>