M1 TRANSITION-PROBABILITIES BETWEEN FINE-STRUCTURE COMPONENTS (2)L(J)(L-GREATER-THAN-OR-EQUAL-TO-1)

Spontaneous emission transition probabilities of the magnetic dipole t ransitions between states of ground state configurations consisting of one nl electron (or a hole) outside a closed shell have been calculat ed by using relativistic terms of order alpha(2)Z(2) and using hydroge nic orbitals to calculate the required overlap integrals. The line str engths calculated for the Boron and Fluorine isoelectronic sequences a re in excellent agreement with the calculations involving Dirac wavefu nctions for all ions upto Z = 60. The maximum difference at the highes t value of Z = 92 is about 6%. Our calculated lifetimes for the state 2p(5) P-2(1/2) for Fluorine-like Mg IV and Fe XVIII are 5.03 s and 51. 7 mu s respectively which are in excellent accord with corresponding v alues 5.00 s and 51.0 mu s calculated by using sophisticated configura tion interaction wavefunctions within the Breit-Pauli approximation. O ur calculated value of lifetime for Thalium-like Pb II is 40.0 ms whic h is in good accord with the experimental value of 41.2 ms. New result s are presented for the highly ionized ions in the Al-like and Cl-like isoelectronic sequences. The present analysis can be exploited for al l the ions in the isoelectronic sequences of elements of groups III A, III B VII A of the periodic table.