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 CZ, Fritzsche S, Haire RG. First observation of atomic levels for the element fermium (Z=100).
Phys Rev Lett 2003;
90:163002. [PMID:
12731975 DOI:
10.1103/physrevlett.90.163002]
[Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2002] [Revised: 03/06/2003] [Indexed: 05/24/2023]
Abstract
The atomic level structure of the element fermium was investigated for the first time using a sample of 2.7x10(10) 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 5f(12)7s(2) (3)H(e)(6) ground state have been determined from their saturation characteristics. Multiconfiguration Dirac-Fock calculations suggest that the leading orders of these levels could be the 5f(12)7s7p (5)I(o)(6) and 5f(12)7s7p (5)G(o)(5) terms.
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