## 3 Results and Discussion
Since the plasma generated in the experiments fulfils the conditions of the partial local thermodynamic equilibrium, the requirement for a \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Ion** & \(\lambda_{ij}\) **(nm)** & \(A_{ij}\) **(s\({}^{-1}\))** & \(E_{j}\) **(eV)** & \(E_{i}\) **(eV)** & \(g_{j}\) & \(g_{i}\) & \(\frac{\lambda_{ij}}{g_{i}A_{ij}}\cdot 10^{-7}\)(\(\frac{\mathrm{nm}}{s^{+}}\)) \\ \hline Ar II & 351.438733 & \(1.36\times 10^{8}\) & 19.261084163 & 22.78797918 & 4 & 6 & 4.31 \\ \hline Ar II & 376.526969 & \(9.8\times 10^{7}\) & 19.222902151 & 22.514803938 & 6 & 6 & 6.40 \\ \hline Ar II & 392.862282 & \(2.44\times 10^{7}\) & 16.81247225 & 19.96749907 & 2 & 4 & 40.25 \\ \hline Ar II & 413.172327 & \(8.5\times 10^{7}\) & 18.426549103 & 21.42648951 & 4 & 2 & 24.30 \\ \hline Ar II & 427.752786 & \(8.0\times 10^{7}\) & 18.454114013 & 21.351799846 & 6 & 4 & 13.37 \\ \hline Ar II & 454.505166 & \(4.71\times 10^{7}\) & 17.140027439 & 19.867157038 & 4 & 4 & 24.12 \\ \hline Ar II & 487.986345 & \(8.23\times 10^{7}\) & 17.140027439 & 19.680048951 & 4 & 6 & 9.88 \\ \hline Ar I & 696.54300 & \(6.4\times 10^{6}\) & 11.54835442 & 13.32785705 & 5 & 3 & 362.78 \\ \hline Ar I & 706.72175 & \(3.8\times 10^{6}\) & 11.54835442 & 13.30222747 & 5 & 5 & 371.96 \\ \hline Ar I & 738.39801 & \(8.5\times 10^{6}\) & 11.62359272 & 13.30222747 & 3 & 5 & 173.74 \\ \hline Ar I & 750.38680 & \(4.5\times 10^{7}\) & 11.82807116 & 13.47988682 & 3 & 1 & 166.75 \\ \hline Ar I & 772.37600 & \(5.2\times 10^{6}\) & 11.54835442 & 13.15314387 & 5 & 3 & 495.11 \\ \hline Ar I & 794.81759 & \(1.86\times 10^{7}\) & 11.72316039 & 13.28263902 & 1 & 3 & 142.44 \\ \hline Ar I & 801.47854 & \(9.3\times 10^{6}\) & 11.54835442 & 13.09487256 & 5 & 5 & 172.36 \\ \hline Ar I & 811.53109 & \(3.3\times 10^{7}\) & 11.54835442 & 13.07571571 & 5 & 7 & 35.13 \\ \hline Ar I & 826.45215 & \(1.53\times 10^{7}\) & 11.82807116 & 13.32785705 & 3 & 3 & 180.05 \\ \hline Ar I & 842.46473 & \(2.15\times 10^{7}\) & 11.62359272 & 13.09487256 & 3 & 5 & 78.37 \\ \hline \hline \end{tabular} \({}^{*}\lambda_{ij}\) is the wavelength of the spectral line corresponding to the transition from energy state \(i\) to energy state \(j\); \(A_{ij}\) is the transition probability; the energy of the upper level \(E_{i}\) and the energy of the lower level \(E_{j}\); \(g_{i}\) and \(g_{j}\) are the statistical weights of the energy levels; ratio \(\lambda_{ij}/g_{i}A_{ij}\) is used in the Boltzmann plot.  
\end{table} 
Table 1: Identified spectral lines in the plasma \({}^{*}\). complete partial local thermodynamic equilibrium should be replaced by the requirement for a low-temperature range in which radiative recombination dominates:  
\[\frac{n_{e}}{\text{m}^{-3}}\geq 1\cdot 10^{20}\bigg{(}\frac{E_{\infty}-E_{g}}{ \text{eV}}\bigg{)}^{5/2}\bigg{(}\frac{k_{B}T_{e}}{\text{eV}}\bigg{)}^{3} \tag{7}\]  
where \(E_{\infty}-E_{g}\) is the ionisation energy of the lower level (ground state \(g\)) [53]. For argon, the ionisation energy of the ground state is \(E_{g}=(15.759\pm 0.001)\) eV. The estimated electron density in our study was in the range of \(10^{21}-10^{23}\) m\({}^{-3}\). The electron temperature and electron density results obtained in our plasma monitoring and analysis are consistent with similar research on the application of non-thermal plasma technology in the food sector. In examining cold plasma as an emerging non-thermal technology for food processing, the authors provide a comprehensive overview of cold plasma applications for the microbiological decontamination of a variety of foods. They emphasise the importance of selecting the appropriate cold plasma technology for different food products depending on the characteristics of the generated plasma, especially the electronic temperature, which should not exceed 20,000 K. The working temperatures range up to 330 K, which preserves the sensory and nutritional properties of the food and reduces the treatment time. In addition, the impressive results of decontamination of various fruits and vegetables are listed [3].