Astron. Astrophys. Suppl. Ser.
Volume 134, Number 2, January II 1999
|Page(s)||369 - 375|
|Published online||15 January 1999|
Atomic data from the IRON Project
XXX. Collision data for the 2Po - 2Po 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
Accepted: 7 August 1998
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.
Key words: atomic data
© European Southern Observatory (ESO), 1999