Affiliation: | (1) Department of Physics, University of Nottingham, University Park, Nottingham, NG7 2RD, England;(2) Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany;(3) Present address: van der Waals-Zeeman Laboralorium, University of Amsterdam, 1018 XE Amsterdam, The Netherlands;(4) Present address: Forschungszentrum Rossendorf, D-01314 Dresden, Germany |