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

Figure 5. 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.

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 × 10²² m⁻³ and 2.1 × 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.