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Branching ratio of two-electron-one-photon transitions in doubly ionized low-Z atoms.

The branching ratio between the one-electron-one-photon and two-electron-one-photon transitions in doubly ionized K shells has been evaluated using an equivalent two-particle model with wave functions including angular correlations and relaxation in the length and velocity gauges. The accuracy of the results (choice of screening parameters and gauge dependence) will be discussed