Exploration of the dynamic process of laser-induced ionization for the preparation of metastable Kr atoms based on the 5p[3/2]2 to 5s[3/2]2 transition

This paper continues the work of our previous study [J. Quant. Spectrosc. Radiat. Transf. 330 109233], further exploring the dynamics of the metastable 5s[3/2]₂ level of Kr atoms prepared by laser-induced ionization. Focusing on the “photon excitation + radiation” process, “electron-impact excitation + radiation” process, and “ion-electron recombination” process, we obtained the corresponding total collisional decay rate constants k_col for the 5p[3/2]₂ level of (1.11±0.09)×10⁻¹¹ cm³ s⁻¹, (0.09±0.03)×10⁻¹¹ cm³ s⁻¹, and (0.0010±0.0001)×10⁻¹¹ cm³ s⁻¹, respectively, based on time-resolved spectra at 760.15 nm. While the corresponding total radiative decay rates k_rad were (2.58±0.75)×10⁷ s⁻¹, (0.88±0.29)×10⁷ s⁻¹, and (0.004±0.001)×10⁷ s⁻¹. Through the analysis and comparison of the total collisional decay rate constants, and radiative decay rates obtained from the three stages, this study provides an in-depth understanding of the dynamic processes of the interactions between the relevant physical mechanisms during laser-induced ionization to produce metastable atoms. It clearly identifies that the changes in the population replenishment rate of the 5p[3/2]₂ level, due to the collision and radiation channels at different stages, are key factors influencing the values of k_col and k_rad.