Beiträge zur Lumineszenzanalyse II

Ohne ZusammenfassungI.: Monatsh. Chem.55, 1930, S. 158, bzw. Sitzb. Ak. Wiss. Wien (II b)139, 1930, S. 74.     

Electric field gradient in nanostructured SnO2 studied by means of PAC spectroscopy using 111Cd or 181Ta as probe nuclei

Electric quadrupole interactions were studied in pure and Mn-doped powder samples and thin films of SnO₂ using perturbed γγ angular correlation spectroscopy (PAC). The powder samples were prepared by Sol gel method and the thin film were prepared on the Si (100) substrate by sputtering technique using Sn in the oxygen atmosphere. The samples were characterized by x-ray diffraction, energy dispersive spectroscopy and scanning electron microscopy. The thickness of the film was 100 nm. The average particle size of the SnO₂ powder samples was determined to be smaller than 60 nm. The radioactive ¹¹¹In and ¹⁸¹Hf tracers were introduced in the powder samples during the sol gel chemical process. Radioactive ¹¹¹In was implanted on the SnO₂ thin films using the University of Bonn ion implanter (BONIS). PAC measurements were carried out in a four BaF₂ detector spectrometer in the temperature range of 77–973 K for samples annealed at different temperatures. The PAC results for both nuclear probes show the presence of two electric quadrupole interactions. The major fractions in both cases correspond to the substitutional sites in the rutile phase of SnO₂. The results are compared with previous PAC measurements.     

Mechanistic study of the addition reaction of TeCl4 to alkynes: Participation of TeCl3 centered-radical

The mechanism of the addition reaction of TeCl₄ to alkynes was indirectly established by the detection of TeCl₃ centered radicals using EPR spin trapping, ESI-MS and ESI-MS/MS characterization.     

Rhythmische Abscheidung von Stearinsäure aus alkoholischer und ätherischer Lösung

Kurze Zusammenfassung Stearins?ure scheidet sich aus hei?er alkoholischer L?sung (100 g in 70 ccm) und aus ges?ttigter ?therischer L?sung in Form von konzentrischen Ringen aus. Ein Versuch, diese Bildung zu erkl?ren, nimmt das Wechselspiel zwischen fortschreitender Abkühlung und freiwerdender Kristallisationsw?rme als ma?gebend an.     

Über Propanal-2-Methyl-2-Brom

Ohne Zusammenfassung     

Die Funksche Integralgleichung der Kugelflächen-funktionen und ihre Übertragung auf die Überkugel

Ohne Zusammenfassung