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First Observation of Atomic Levels for the Element Fermium (Z=100)

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Title:
First Observation of Atomic Levels for the Element Fermium (Z=100) Authors:
Sewtz, M.; Backe, H.; Dretzke, A.; Kube, G.; Lauth, W.; Schwamb, P.; Eberhardt, K.; Grüning, C.; Thörle, P.; Trautmann, N.; Kunz, P.; Lassen, J.; Passler, G.; Dong, C. Z.; Fritzsche, S.; Haire, R. G. Affiliation:
AA(Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany), AB(Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany), AC(Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany), AD(Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany), AE(Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany), AF(Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany), AG(Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany), AH(Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany), AI(Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany), AJ(Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany), AK(Institut für Physik, Universität Mainz, D-55099 Mainz, Germany), AL(Institut für Physik, Universität Mainz, D-55099 Mainz, Germany), AM(Institut für Physik, Universität Mainz, D-55099 Mainz, Germany), AN(Fachbereich Physik, Universität Kassel, D-34132 Kassel, Germany), AO(Fachbereich Physik, Universität Kassel, D-34132 Kassel, Germany), AP(Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6375) Publication:
Physical Review Letters, vol. 90, Issue 16, id. 163002 (PhRvL Homepage) Publication Date:
04/2003 Origin:
APS PACS Keywords:
Atomic spectra, Theory of electronic structure electronic transitions and chemical binding, Ionization potentials electron affinities, Intensities and shapes of atomic spectral lines DOI:
10.1103/PhysRevLett.90.163002 Bibliographic Code:
2003PhRvL..90p3002S

Abstract

The atomic level structure of the element fermium was investigated for the first time using a sample of 2.7×1010 atoms of the isotope
255
Fm with a half-life of 20.1h. The atoms were evaporated from a filament and stored in the argon buffer gas of an optical cell. Atomic levels were sought by the method of resonance ionization spectroscopy using an excimer-dye-laser combination. Two atomic levels were found at wave numbers (25 099.8±0.2) and (25 111.8±0.2) cm-1. Partial transition rates to the 5f127s2
3
He6 ground state have been determined from their saturation characteristics. Multiconfiguration Dirac-Fock calculations suggest that the leading orders of these levels could be the 5f127s7p
5
Io6 and 5f127s7p
5
Go5 terms.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)