EDP Sciences
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Volume 365, Number 2, January II 2001
Page(s) 248 - 251
Section Atomic and molecular data
DOI http://dx.doi.org/10.1051/0004-6361:20000189

A&A 365, 248-251 (2001)
DOI: 10.1051/0004-6361:20000189

2s-photoionisation of atomic magnesium: Shake processes and Coster-Kronig radiationless decay

A. 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 $\rm 3s \rightarrow 4s$ 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$^\circ$ 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