Phys. Rev. Lett. 90, 163002 (2003) [4 pages]

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

Abstract

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Citing Articles (15)

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M. Sewtz, H. Backe, A. Dretzke, G. Kube, W. Lauth, and P. Schwamb
Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany

K. Eberhardt, C. Grüning, P. Thörle, and N. Trautmann
Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany

P. Kunz, J. Lassen, and G. Passler
Institut für Physik, Universität Mainz, D-55099 Mainz, Germany

C. Z. Dong and S. Fritzsche
Fachbereich Physik, Universität Kassel, D-34132 Kassel, Germany

R. G. Haire
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6375

Received 25 October 2002; revised 6 March 2003; published 25 April 2003

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 ²⁵⁵Fm with a half-life of 20.1 h. 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 ³H₆^e 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 ⁵I₆^o and 5f¹²7s7p ⁵G₅^o terms.

URL: http://link.aps.org/doi/10.1103/PhysRevLett.90.163002
DOI: 10.1103/PhysRevLett.90.163002
PACS: 32.30.–r, 31.10.+z, 32.10.Hq, 32.70.–n

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Phys. Rev. Lett. 90, 163002 (2003) [4 pages]

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

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