Issue |
Astron. Astrophys. Suppl. Ser.
Volume 134, Number 2, January II 1999
|
|
---|---|---|
Page(s) | 369 - 375 | |
DOI | https://doi.org/10.1051/aas:1999437 | |
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
Received:
8
June
1998
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