This is the third paper in a series giving collision rates for electron excitation of the 2Po - 2Po ground state fine-structure transition in aluminium-like ions. In this paper we give data for the transitions in P iii (17.9 μm), S iv (m) and Cl v (6.71 μm). For the P and Cl ions the only existing results are nearly 30 years old and were obtained using a method which does not incorporate resonance effects. For S iv, previous close-coupling calculations do exist but we show that our more elaborate calculation changes the rate coefficients by about 50% at lower temperatures.
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Saraph et al. (1999) studied this question.