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[en] A new method of optical pumping in an ion beam cooler buncher has been developed to selectively enhance ionic metastable state populations. The technique permits the study of elements previously inaccessible to laser spectroscopy and has been applied here to the study of Nb. Model independent mean-square charge radii and nuclear moments have been studied for 90,90m,91,91m,92,93,99,101,103Nb to cover the region of the N=50 shell closure and N≅60 sudden onset of deformation. The increase in mean-square charge radius is observed to be less than that for Y, with a substantial degree of β softness observed before and after N=60.
Journal
[en] RF cleaning of thin films of NbN is studied by X-ray photo-electron spectroscopy (XPS) and compared with Nb cleaning. A comparison between air-oxidized Nb and NbN films shows that the NbN oxidation is less dependent on polluting elements than the Nb one. By thermal oxidation at different pressures and temperatures (<= 10-2 mbar and <= 2000C) there is formation of an interface composed essentially of NbOsub(x)(x<2.5) then of Nb2O5, with diffusion of nitrogen through oxides layer. The saturation layer of oxides and the interface are thinner than those of Nb films
[fr]
Le decapage de films minces de NbN par plasma d'argon Radio Frequence a ete etudie par spectroscopie de photo-electrons X (XPS) et compare a celui des films de Nb. Une comparaison des oxydations natives de ces films met en evidence le fait que l'oxydation de NbN depend moins des elements polluants presents que celle du Nb. Une etude de l'oxydation thermique de films de NbN a differentes pressions et differentes temperatures (<= 10-2 mbar et <= 2000C) montre qu'il y a formation d'un interface constitue essentiellement de sous-oxydes de niobium puis de pentoxyde de niobium Nb2O5, l'azote diffusant dans la couche oxyde. L'epaisseur d'oxydes formes, ainsi que l'epaisseur de l'interface metal-pentoxyde restent inferieures a celles obtenues pour les films de NbJournal
Revue de Physique Appliquee; ISSN 0035-1687; 
; v. 19(12); p. 979-986
; v. 19(12); p. 979-986
[en] The niobium(0) compound [Nb(mes)2] (mes=1,3,5-trimethylbenzene) was prepared not only by metal atom-ligand cocondensation, but also by reduction of the NbX5/AlX3 system with aluminum in the presence of aromatic hydrocarbons. The chemical behavior of this compound is similar to that of the analogous complex [V(mes)2]. For example, it reacts under carbon monoxide atmosphere to give the green salt [Nb(mes)2(CO)][Nb(CO)6]. (orig./EF)
[de]
Nicht durch Metallatom-Ligand-Cokondensation, sondern Reduktion des Systems NbX5/AlX3 mit Aluminium in Gegenwart aromatischer Kohlenwasserstoffe wurde die Niob(0)-Verbindung [Nb(mes)2](mes=1,3,5-Trimethylbenzol) hergestellt. Das chemische Verhalten dieser Verbindung gleicht der des analogen [V(mes)2]. Beispielsweise reagiert es in Kohlenmonoxidatmosphaere zum gruenen Salz [Nb(mes)2(CO][Nb(CO)6]. (orig./EF)Journal
Angewandte Chemie. International Edition in English; ISSN 0570-0833; ; CODEN ACIEA; v. 30(1); p. 102-103
; CODEN ACIEA; v. 30(1); p. 102-103
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