Abstract
Calculations of the magnetic dipole M1 transition rates between 3P0 to 3P1 and 3P1 to 3P2 levels of 1s22s2p configuration in the beryllium isoelectronic sequence have been performed using the multiconfigurational Dirac-Fock extended average level (MCDF-EAL) method. Three nonrelativistic configurations 1s22s2, 1s22p2 and 1s22s2p are used. Breit and QED effects are treated as first-order perturbations. The role of the relativistic effects is crucial for the calculation of these transition rates. The transition rates between the magnetic fine-structure levels show a screened scaling behaviour. Experimental data are not available for comparison with the results.