In the present work, we have deduced the fluorescence (ω ₁, ω ₂, ω ₃) and Coster–Kronig (CK)(f ₁₂, f ₁₃, f ₂₃) yields for Sn (Z = 50) and Sb (Z = 51) from the L _i (i = 1–3) sub-shell x-ray intensities measured using the energy tunable synchrotron radiation employing the selective photoionization method. For both the elements, yields have been obtained using two sets of theoretical photoionization cross sections based on the non-relativistic Hartree–Fock–Slater (HFS) model and the self-consistent Dirac–Hartree–Fock (DHF) model. In case of Sb, we have obtained a third set of measured yields also by using the experimental photoionization cross sections evaluated from independent measurements of the mass-attenuation coefficients. The experimental yields for Sb are reported for the first time by us. We have compared the present deduced fluorescence and CK yields with the Dirac–Hartree–Slater model based values, the semi-empirical values tabulated by Krause and the earlier reported values. In case of Sn, using the DHF and the HFS model based photoionization cross sections, two sets of present measured L₁ sub-shell fluorescence yields (ω ₁) are found to be 0.039 0.007 and 0.036 0.003, and the CK yields (f ₁₃) are found to be 0.428 0.107 and 0.405 0.028, respectively. In case of Sb, using three sets of the photoionization cross sections (DHF, HFS and recent experimental values), the ω ₁ values are measured to be 0.042 0.007, 0.040 0.004 and 0.047 0.005, and the CK yields are measured to be 0.343 0.085, 0.297 0.021 and 0.247 0.022, respectively. The comparison of these present measured yields with the theoretical values provided a reliable experimental evidence indicating cut-off of the intense L₁–L₃M_4,5 CK transitions at Z = 50.

在目前的工作中，我们推导出的荧光（ω ₁，ω ₂，ω ₃）和科斯特-克朗尼希（CK）（˚F ₁₂，˚F ₁₃，˚F ₂₃）的收益率的Sn（Ž = 50）和Sb（ž = 51）从L_我（我 = 1-3) 使用选择性光电离方法的能量可调同步辐射测量的亚壳层 X 射线强度。对于这两种元素，使用基于非相对论 Hartree-Fock-Slater (HFS) 模型和自洽 Dirac-Hartree-Fock (DHF) 模型的两组理论光电离截面获得了产率。在 Sb 的情况下，我们还通过使用从质量衰减系数的独立测量中评估的实验光电离截面获得了第三组测量产率。我们首次报道了 Sb 的实验产率。我们已经将目前推导出的荧光和 CK 产率与基于 Dirac-Hartree-Slater 模型的值、Krause 列出的半经验值和早期报告的值进行了比较。在 Sn 的情况下，_发现1子壳荧光产率( ω ₁ )为0.039 0.007和0.036 0.003，发现CK产率( f ₁₃ )分别为0.428 0.107和0.405 0.028。在 Sb 的情况下，使用三组光电离截面（DHF、HFS 和最近的实验值），测得的ω ₁值为 0.042 0.007、0.040 0.004 和 0.047 0.005，测得的 CK 产率为 0.3453 0.0.0。 , 0.297 0.021 和 0.247 0.022，分别。这些当前测量的产率与理论值的比较提供了可靠的实验证据，表明强 L ₁ –L ₃ M _4,5 CK 转变在Z = 50。