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Berlin 2001 – scientific programme

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A: Atomphysik

A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)

A 12.28: Poster

Thursday, April 5, 2001, 12:30–15:00, AT3

SYSTEMATIC STUDY OF AUGER DECAY IN HOLLOW ATOMS — •Nathalie Vaeck1, Nourédine Zitane1, Pascal Quinet2,3, and Patrick Palmeri31Laboratoire de Chimie Physique Moléculaire, ULB, Belgium — 2IPNAS, Université de Liège, Belgium — 3Astrophysique et Spectroscopie, UMH, Belgium

Hollow atoms are characterized by a large number of vacant inner shells and electrons occupying the outer shells. These ’exotic’ atomic species are formed in collision processes between highly-charged ions and several types of targets such as atoms, molecules, solid surfaces and clusters. In the present work, the general behaviour of the Auger rates of hollow atoms for different types of configurations involving identical or non-identical electrons is studied in order to extract simple rules for the decay properties of these complex systems. For highly charged ions neutralized with electrons in excited configurations, conventional calculations (such as those using the atomic structure codes HFR, MCHF, GRASP, ...) are generally out of reach. Therefore, we have developed a global approach which allows to estimate the Auger rates for these ’exotic’ systems. When using this method in several simple cases (nitrogen, neon, ...), it has been possible to reproduce Hartree-Fock results with good accuracy (within a few percent). Our new approach has also allowed us to calculate lifetimes for some very complex configurations which cannot be considered using atomic structure codes because of computer limitations.

Acknowledgements

PQ and PP are respectively Research Associate and Postdoctoral Researcher of the Belgian National Fund for Scientific Research (FNRS).

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