Level-crossing-Experimente in angeregten Termen des Lu I zur Untersuchung der Hyperfeinstruktur von 175 Lu / Hyperfine Structure Investigations of Excited States of Lu I by Means of the Level-crossing Method
Open Access
- 1 May 1970
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 25 (5) , 611-620
- https://doi.org/10.1515/zna-1970-0507
Abstract
The magnetic dipol and the electric quadrupol interaction constants in the excited electronic states 5d6s6p (1D) 2D3/2 and 5d6s6p (1D) 2F5/2 of 175Lu I in natural isotopic abundance were investigated. The measurement was performed by resonance scattering of light with wavelengths λ = 4518.57 Å and λ = 3567.84 Å on a lutetium atomic beam. The following hyperfine structure constants were obtained: B/A{(1D) 2D3/2} = +0.34704(80) ; A{(1D) 2D3/2} =-1313.34(50) gJ/0.80 MHz; B{(1D) 2D3/2} =- 455.8(1.2) gJ/0.80 MHz; B/A{(1D) 2F5/2} = +9.7883(37) ; A{(1D) 2F5/2} =+ 351.864(56) gJ MHz; B{(1D) 2F5/2} = + 3444.2 (1.9) gJ MHz. The signs of the interaction constants were determined by examinations of these lines in a Fabry- Perot-interferometer. The lifetimes of the investigated states were found as follows: τ{(1D) 2D3/2} = (4.9 ± 0.1) · 10-8 s; τ{(1D) 2F5/2) = (1.2 ± 0.1) · 10-8 s. From these the oscillatorstrengths were deduced: ƒ(3567.8 Å) = (1.7 + 0.2) · 10-1; ƒ(3841.2 Å) = (5.6 + 0.8) · 10-2; ƒ(4518.6 Å) = (6.3 ± 0.1) · 10-2; ƒ(4967.5 Å) < 3 · 10-4.Keywords
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