A detailed fine-structure resolved collisional radiative model is developed to investigate the laser-produced Mg plasma. The dominant processes linked with the electron impact excitation and de-excitation have been considered explicitly in a very reliable and consistent manner in the present model. The required electron impact excitation cross-sections of Mg for the large number of transitions from the ground state 3s² (J = 0) to the 3s3p, 3s4s, 3s3d, 3s4p, 3s5s, 3s4d, 3s5p, 3s6s, 3s5d, and 3s6p excited states and from 3s3p manifolds to the other fine-structure levels of 3s4s, 3s3d, 3s5s, 3s4d, 3s6s, and 3s5d configurations are obtained using the fully relativistic distorted wave approach. To ensure the accuracy of our calculations, where available, the oscillator strengths and cross-sections are compared with previous measurements and other calculations. Further, plasma diagnostics are carried out by coupling the present collisional radiative model with the laser-induced breakdown spectroscopy measurements reported by Delserieys etal (2009 J. Appl. Phys., 106, 083304). Five measured intense emission lines of Mg viz 383.3, 470.3, 517.8, 552.8, and 571.1nm are used and corrected through the self-absorption to extract the plasma parameters i.e. electron temperature and electron density. The obtained plasma parameters at different delay times ranging from 100–700ns are compared with the results of Delserieys etal (2009 J. Appl. Phys., 106, 083304) that were estimated using the Thomson scattering and Boltzmann plot approaches.

开发了一个详细的精细结构解析碰撞辐射模型来研究激光产生的镁等离子体。在本模型中，以非常可靠和一致的方式明确考虑了与电子撞击激发和去激发相关的主要过程。从基态 3s ² ( J= 0) 到 3s3p、3s4s、3s3d、3s4p、3s5s、3s4d、3s5p、3s6s、3s5d 和 3s6p 激发态以及从 3s3p 流形到 3s4s、3s6s3d、3s6s3d 和 3s6s3d 的其他精细结构能级， 3s5d 配置是使用完全相对论扭曲波方法获得的。为了确保我们计算的准确性，在可用的情况下，将振荡器强度和横截面与以前的测量和其他计算进行比较。此外，等离子体诊断是通过将本碰撞辐射模型与 Delserieys等人(2009 J. Appl. Phys. , 106)报道的激光诱导击穿光谱测量相结合来进行的。, 083304)。使用五个测量的 Mg 强发射谱线，即 383.3、470.3、517.8、552.8 和 571.1nm，并通过自吸收校正以提取等离子体参数，即电子温度和电子密度。将在 100-700ns 范围内的不同延迟时间获得的等离子体参数与 Delserieys等人(2009 J. Appl. Phys. , 106 , 083304)的结果进行比较，这些结果是使用汤姆森散射和玻尔兹曼图方法估计的。