Oscillator Strengths for Fluorine Isoelectronic Sequence

Oscillator strengths (f‐values) are calculated for five members of the F‐isoelectronic sequence, namely, P6+, Ar9+, Sc12+, Cr15+ and Co18+. The Single Configuration Hartree‐Fock program (SCHF) is used to generate the wave functions needed in the calculation of radiative transition probabilities and oscillator strengths (f‐values) for singly excited states in the studied ions. Specifically, the work includes the radiative transitions of the form n1l1 → n2l2. The transitions are classified into sets according to the values of l1 and l2, with n1 and n2 = 9, 8, …, 3. Both l1 and l2 are limited (here) to be less than 4. The angular momentum average scheme (AMA) is utilized for all the calculations of the radiative rates Ar’s, and f‐values. The trends of oscillator strengths with the effective charge (Zeff) and principal quantum numbers n1 and n2 of the upper and lower states are investigated. It is found that, the f‐values decrease as (1/n1)4.5 for dominant transitions in low‐ionized ions (P6+).