Perturbation theory Z expansion for many-electron autoionisation states of atomic system. II. Autoionisation rates and radiative transition probabilities

Abstract

For pt.I see ibid., vol.12, no.19, p.3171 (1979). A theory for calculating autoionisation rates and radiative transition probabilities using the Z-expansion technique which is suitable for autoionisation degenerated states of many-electron systems is given. The autoionisation rates are considered as the imaginary part of the energies and are calculated in an analogous manner to the real part. Only the first non-zero term was taken into account. The calculations have been carried out for ions with 4-9 electrons and Z=6-30. The roles of correlation and relativistic effects are discussed. The importance of intercombination transitions is pointed out. The numerical results are given for the Be, N, O and F isoelectronic sequences.