Boltzmann plot constructed with 44 Cu II lines recorded 120 ns after the laser pulse and at a distance of 2 mm from the copper surface

<p><strong>Figure 4.</strong> Boltzmann plot constructed with 44 Cu II lines recorded 120 ns after the laser pulse and at a distance of 2 mm from the copper surface. The symbols \Box, and ▵ represent transition probabilities (<em>A</em>) taken from [<a href="http://iopscience.iop.org/0953-4075/46/18/185701/article#jpb478486bib01" target="_blank">1</a>, <a href="http://iopscience.iop.org/0953-4075/46/18/185701/article#jpb478486bib16" target="_blank">16</a>] and [<a href="http://iopscience.iop.org/0953-4075/46/18/185701/article#jpb478486bib18" target="_blank">18</a>], respectively. The line intensities (<em>I</em>) were obtained as values proportional to the area under the line profile fitted to the Voigt function. Wavelengths (λ), statistical weights (<em>g</em>) and upper energy levels (<em>E<sub>u</sub></em>) were taken from the same references.</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>