Precise calculation of the electron temperature of laser-induced water scale plasma

To reduce the calculation error induced by the uncertainty of the parameters, such as spectrum spontaneous emission transition probabilities, the electron temperature of the laser-induced water scale plasma was studied using a modified iterative Boltzmann algorithm. After 12 iterations, the linear correlation coefficient was increased from 0.7687 up to 0.99991 while the electron temperature of the water scale plasma was 5012K. After the fitting of Ca Ⅱ 393.37nm by Lorentz function, the electron density of water scale plasma was 5.7×1016cm-3, much higher than the critical value of 6.4×1015cm-3. The laser-induced water scale plasma was proved to meet the local thermodynamic equilibrium model. The experimental results show that this method not only is simple, but also can improve the solution accuracy of the characteristic parameters of the plasma significantly.