A&A 365, 248-251 (2001)
2s-photoionisation of atomic magnesium: Shake processes and Coster-Kronig radiationless decayA. G. Kochur1 , D. Petrini2 and E. P. da Silva3 .
1 Rostov State University of Transport Communication, 344038 Rostov-on-Don, Russia
2 Observatoire de la Côte d'Azur, Department G. D. Cassini, BP 4229, 06304 Nice Cedex 4, France
3 Departamento de Física, U.F.C., CP 6030, Fortaleza 60455-760, Ceará, Brazil
(Received 13 June 2000 / Accepted 20 September 2000)
2s-photoionization of magnesium is analyzed for incident energies ranging up to three times the 2s threshold (96.6 eV). The 3s shake processes amount to almost 30% of single photoionization. The shake-up cross section exceeds 14% of the single one, and the conjugate shake-up probability plays an important role in the energy range up to three times the 2s threshold. The 2s2p63s2 Auger and Coster-Kronig rates are calculated, and the 2s22p53s 1P exit is found to be favoured (80% of the total decay), giving rise to the line MgIII 231.73 Å.
Key words: atomic data -atomic processes -line formation
Offprint request: D. Petrini
© ESO 2001