Action of Slow Neutrons on Rare Earth Elements

Hevesy, G.; Levi, Hilde

doi:10.1038/137185a0

Cited by 58 publications

(17 citation statements)

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“…He was well aware that this observation was not quite in agreement with current theories, but he was confident enough in his separation skills that he did not attribute the radioactivity in the lanthanoid salt to naturally occurring radionuclide impurities, as others interpreted this observation 1 ). In fact, Auer von Welsbach thereby incidentally discovered the production of artificial radionuclides (24 years before Frédéric Joliot and Irène Curie [6]), (spontaneous) fission (29 years before Meitner and Frisch [7], and Hahn and Straßmann [8]), the neutron (22 years before Chadwick [5]), and lastly the principle of neutron-activation analysis (26 years before Hevesy and Levi [9]). Auer von Welsbach predicted that this observation might be of importance for the field of radioactivity research.…”

mentioning

confidence: 99%

Nitrogen‐Rich Compounds of the Lanthanoids: Highlights and Summary

Steinhäuser

Giester

Leopold

et al. 2010

Helvetica Chimica Acta

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In this third part of our research on the 5,5'-azobis[1H-tetrazol-1-ides] (ZT) of the lanthanoids, we present two compounds with La 2 (ZT) 3 moieties with very different coordination modes between the cations and the anions. One La 2 (ZT) 3 -containing compound is interesting, because it contains trimeric La 3 (ZT) 3 III cations, which are arranged in a windmill-like structure. Moreover, the first double salt of a ZT compound, namely the carbonate compound La 2 (ZT) 2 (CO 3 ) · 12 H 2 O, is presented and discussed. Another highlight of nitrogen chemistry is the first molecular structure of a 5-azido-2H-tetrazole (CHN 7 ) molecule, in the form of the spectacular compound Dy 2 (ZT) 3 · 4 CHN 7 · 24 H 2 O. This is the first known complete molecular structure of an azidotetrazole molecule (the organic molecule with the highest nitrogen-content: 88.3% N). All compounds have been characterized completely including elemental analyses, vibrational (IR and Raman) spectroscopy, and X-ray crystal-structure determination. We summarize our nitrogen-rich compounds of the lanthanoids project and extensively discuss selected literature on this topic and compare previously published results with ours.

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confidence: 99%

Nitrogen‐Rich Compounds of the Lanthanoids: Highlights and Summary

Steinhäuser

Giester

Leopold

et al. 2010

Helvetica Chimica Acta

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“…Together with Hilde Levi, he observed the extremely high activation yield of dysprosium and europium, which brought him to the idea of taking advantage of this fact by a new analytical method, the neutron activation analysis [23,24]. He wrote about this discovery in 1964: "Auer von Welsbach presented me on each of my visits with minute amounts of all the rare earth elements.…”

Section: The Discovery Of Neutron Activation Analysis Seventy Years Agomentioning

confidence: 93%

George de Hevesy (1885–1966), founder of Radioanalytical Chemistry

Niese¹

2006

Czech J Phys

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“…In the first experiments, they found that the induced radioactivity decreased in different matrices with different decay constants, suggesting that this method could be used to gain information on the composition of mixtures of rare earth compounds (1).…”

Section: Introductionmentioning

confidence: 98%