Astron. Astrophys. 348, 659-661 (1999)

Research Note

K-photoionisation of atomic carbon: shake up processes

D. Petrini ¹ and E.P. da Silva <sup>2

1</sup> Observatoire de la Côte d'Azur, Department G.D. Cassini, B.P. 229, F-06304 Nice Cedex 4, France (petrini@obs-nice.fr)
² Departamento de Fsica, U.F.C., CP 6030, Fortaleza, Ceará, Brazil 60455-760 (euclimar@fisica.ufc.br)

Received 7 April 1999 / Accepted 16 June 1999

Abstract

We evaluate the shake up process in the K-photoionisation of atomic carbon, i.e. the 2s 2p and 3s, and 2p 3p shake up excitations, within the photon energy range 25 to 45 Ry. As in the atomic boron case, the 2s 3s excitation is still relatively strong and due to configuration interaction effects dominates the 2p subshell excitation to 3p. The conjugate shake up 2s 2p is 3% near 45 Ry, decreasing slowly as expected. This infers that the shake off process would lead mostly to terms related to the configurations 1s2s2p² with a percentage of about 20%.

Key words: atomic data atomic processes line: formation

Send offprint requests to: D. Petrini

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Contents

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© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999
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