Institution: | Universit?t Gesamthochschule Essen, Fachbereich Physik, 45117 Essen, Germany (Fax: +49-201/183-2120, E-mail: chigrin@theo-phys.uni-essen.de), DE Belarusian State University, Department of Physics, Fr. Skarina Ave. 4, 220080 Minsk, Belarus (E-mail: lavrinenko@phys.bsu.unibel.by), BY Institute of Molecular and Atomic Physics, National Academy of Sciences, 220072 Minsk, Belarus (E-mail: gaponen@imaph.bas-net.by; http://imaph.bas-net.by), BY
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