*3.2. Second Method*

In order to diagnose the plasma with a single experiment, the Stark width and the Stark shift of the Hα-line were used together for the first time in a combined way on the basis of the theoretical values of Griem [30] in the Equation (1). The experimental data presented in Table 1 were cross-checked with all the parameters provided by Griem and those situations that were coherent were conserved. As an example, for a 500 ns measurement window and a delay time of 4 μs, the experimental value obtained from <sup>Δ</sup>λ1/2 = 14.4 ± 2.5 Å (see Figure 5), only provides a coherent value of electron density for the parameter <sup>α</sup>1/2 at the electron density of (1.78 ± 0.3) × 10<sup>17</sup> cm<sup>−</sup><sup>3</sup> and at the temperature of 14,000 ± 2000 K. With a parameter <sup>α</sup>1/2 corresponding to any other pair of values of electron density and temperature, the numerical results obtained would not be consistent. If *Ne* = 10<sup>17</sup> cm<sup>−</sup><sup>3</sup> and *T* = 10,000 K are chosen, the tabulated value of <sup>α</sup>1/2 would be 0.0186, which would give an electron density of 1.729 × 10<sup>17</sup> cm<sup>−</sup><sup>3</sup> (about 70% different to the initial value of 10<sup>17</sup> cm<sup>−</sup>3).

By using this method, the values for *Ne* and *T* presented in Table 3 were obtained. To confirm these results, the red shift values of the measured Hα-line were compared to the theoretical values provided by different authors [20,29] for the electron densities and the temperatures estimated in this work. An example of this comparison is presented in Table 4. In most cases the obtained value was very close to the theoretical values of these authors within the acknowledged experimental uncertainty levels, which allows us to state that the estimated values for electron density and temperature were consistent with the experimental results for the widths and shifts obtained in this work.

**Table 3.** Electron densities and temperatures deduced from experimental values of Stark broadening of the Hα-line obtained in the LSP experiments of this work. *Ne* is 10<sup>17</sup> cm<sup>−</sup><sup>3</sup> units and *T* is 10<sup>3</sup> K units.


**Table 4.** Experimental Stark shifts of the Hα-line obtained in this work compared to the theoretical values found in the literature.

