Systematic studies of the - transition in the Be-like sequence

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Abstract
Results from systematic multiconfiguration Hartree - Fock studies of the - transition in the Be-like sequence in the range of Z = 4 - 10 are reported for several models. The inclusion of core - valence correlation is essential for obtaining good agreement in the length and velocity form of the oscillator strength, the agreement improving with Z and reaching one part in 4000 for neon. In the case of Be, extensive cancellation occurs in the calculation of the dipole matrix element and correlation in the core already plays a role at the 1% level of accuracy. The orbitals obtained from the core correlation model were used in a Breit - Pauli calculation mixing states. The effect on the allowed transition data is included. The present calculations are generally in better agreement with semi-empirical values predicted from experiment than from experiment itself.