Transitions from the ground states of fluorine-like ions

We present oscillator strengths of transitions between the levels of the ground state and those of the 2 s 2 p 6 , 2 s 2 2 p 4 3 s and 2 s 2 2 p 4 3 d states for several fluorine-like ions: Mg IV, S VIII, Cl IX, Ti XIV, Fe XVIII and Ni XX. The wave functions are of fairly simple configuration interaction type, and have previously been used to describe target states in R -matrix calculations of excitation collision strengths. There is generally good agreement with the work of Fawcett (1984), but substantial improvements are made for the 2 s 2 2 p 5 -2 s 2 p 6 transitions by a fuller treatment of electron correlation.