In the present method, the effective potential is chosen to make the binding energy of the transition K-electron equal to its ionization potential and the K-shell electron capture cross section is an analytical expression. 与其它现有理论不同之处在于本文的模型势的选择是让参与跃迁的K电子的结合能(bindingenergy)等于其电离能。在MPOBK近似中,K壳层电子俘获截面是一个解析表达式。