Atomic data from the IRON Project

XXX. Collision data for the ²P^o - ²P^o   fine-structure lines of P iii, S iv and Cl v

Department of Physics and Astronomy, University College London, London WC1E 6BT, UK

Send offprint request to: H.E. Saraph

Received: 8 June 1998
Accepted: 7 August 1998

Abstract

This is the third paper in a series giving collision rates for electron excitation of the ²P^o - ²P^o 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.