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  • 1965-1969  (21)
  • 1930-1934  (1)
  • 1920-1924  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 201 (1967), S. 153-171 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The asymmetry coefficient of theβ-circularly-polarizedγ-correlation of allowedβ-decays has been measured for several nuclides with high accuracy. The polarimeter was a new type. Here the magnet is used as Compton-scatterer and asβ-spectrometer at the same time with the advantage that one has four coincidence possibilities between twoγ- and twoβ-counters. The results of the measurements are the following: NuclidA Na24 +0.102±0.006 Ar41 +0.066±0.025 Sc46 +0.103±0.004 Ca47 +0.383±0.018 V48 −0.059±0.010 Mn52 −0.019±0.010 Co56 +0.002±0.010 Co59 −0.106±0.023 Ag110m +0.058±0.007 Cs134 −0.069±0.007 Fermi matrix elements are determined from these values and their physical implications are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 236 (1968), S. 396-406 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Wäßrige Lösungen von 131J-markierten anorganischen Jodverbindungen verschiedener Oxydationsstufen wurden durch Dünnschicht-Chromatographie an Kieselgel mit Aceton-Isopropanol-wäßr. Ammoniak-Gemischen als Laufmittel getrennt. Es wurde festgestellt, daß auf Kieselgelplatten aufgetragenes Jodid beim Lagern an der Luft allmählich in höhere Oxydationsstufen übergeht. Bei gleichzeitiger Belichtung bilden sich Jodat, Perjodat und mehrere noch nicht identifizierte Jodverbindungen. Beim Lagern in Dunkelheit entsteht wohl Perjodat, die Bildung von Jodat bleibt jedoch aus. Gleichzeitig tritt eine geringfügige Verflüchtigung von Jod auf. Die Störungen können durch sofortige chromatographische Entwicklung nach dem Auftrag und Vermeidung von Belichtung eliminiert werden. Zur Identifizierung der bei der Trennung auftretenden Jodverbindungen dienten elektrophoretische Untersuchungen. Um Änderungen der Oxydationsstufen mit der Zeit möglichst auszuschließen, wurde die elektrophoretische Trennung gleichzeitig mit der der chromatographischen Entwicklung durch Anlegen eines elektrischen Feldes an die Dünnschichtplatte quer zur Fließrichtung des Laufmittels durchgeführt (zweidimensionales Verfahren).
    Notes: Summary Aqueous solutions of 131I-labeled inorganic iodine compounds of different oxidation stages have been separated by thin-layer chromatography on silica gel using acetone-isopropanol-aq. ammonia as solvent. It has been observed that iodide on silica gel plates is gradually converted to higher oxidation stages when stored in the atmosphere. When exposed to light at the same time iodate, periodate and several not yet identified iodine compounds are formed. When protected from light periodate is still formed, yet iodate is not. A slight vaporization of iodine occurs of the same time. These interferences can be prevented by immediate development after application and protection from light. Electrophoresis was employed for the identification of the different iodine compounds. In order to avoid changes in the oxidation stage in the course of time the electrophoretic separation has been carried out simultaneously with the chromatoment (two-dimensional procedure).
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 226 (1969), S. 86-102 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theβ-γ circular polarization asymmetry of allowedβ-decays has been measured for three nuclides. The polarimeter was the at Karlsruhe developed type. The results of the measurements are the following: NuclidA Sc48+0.0553± 0.0055 Ni65+0.292±0.037 Eu152+0.107±0.012 From these values the Fermi- and effective Coulomb matrix elements are determined. Corrections from higher order forbidden matrix elements are discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 64 (1924), S. 402-403 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 244-244 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 7 (1968), S. 231-232 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 349 (1967), S. 258-268 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The interaction of CO with a solution of KNH2 in liquid NH3 yields a)at mole ratios KNH2:CO 〈 1:l and 20-60°C: both formamide and potassium formamide (see the first equation in „Inhaltsübersicht“); KNH2 catalysing the formation of formamide;b)at KNH2:CO 〉 1:l and 40-60°C: potassium cyanate and H2; andc)at KNH2:CO 〉 1: 1 and 120°C: dipotassium urea and H2 (see above for the corresponding equations).
    Notes: Die Reaktionen von CO mit Lösungen von KNH2 in flüssigem NH3 werden unter zwei Gesichtspunkten untersucht: 1Das Molverhältnis KNH2: CO ist kleiner als 1:1. Gemäß: entstehen Formamid und Kaliumformamid nebeneinander. Es wird gezeigt, daß KNH2 die Bildung von Formamid aus CO und NH3 zwischen 20 und 60° zu katalysieren vermag.2Das Molverhältnis von KNH2:CO ist größer als 1:1. Während zwischen 40 und 60° Kaliumcyanat und H2 gebildet werden: entstehen bei 120° Dikaliumharnstoff und H2: Die Reaktionsmechanismen dieser Umsetzungen werden diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 349 (1967), S. 241-250 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: According to the first equation in „Inhaltsübersicht“, Mn2(CO)10 disproportionates in liquid NH3 at 20°C to tricarbonyl-triammine-manganese(+I)-pentacarbonyl-manganate(-I), whose cation, [Mn(CO)3(NH3)3]+, has been characterized by means of analyses, IR spectra and its magnetic properties.
    Notes: Mn2(CO)10 unterliegt in flüssigem NH3 bei 20°C der Valenzdisproportionierung unter Bildung von Tricarbonyl-triammin-mangan(+I)-pentacarbonyl-manganat(-I): \documentclass{article}\pagestyle{empty}\begin{document}$${\rm Mn}_{\rm 2} ({\rm CO})_{10} + 3{\rm NH}_3 \to [{\rm Mn(CO)}_{\rm 3} ({\rm NH}_{\rm 3})_3][{\rm Mn(CO)}_{\rm 5}] + 2{\rm CO}.$$\end{document} Das hierbei freigesetzte CO reduziert teils unverändertes Mn2(CO)10 gemäß: \documentclass{article}\pagestyle{empty}\begin{document}$${\rm Mn}_{\rm 2} ({\rm CO})_{10} + {\rm CO} + 2{\rm NH}_{\rm 3}) \to 2{\rm HMn(CO)}_{\rm 5} + {\rm CO(NH}_{\rm 2} {\rm)}_{\rm 2},$$\end{document} teils erfolgt Carbonylierung des NH3: \documentclass{article}\pagestyle{empty}\begin{document}$${\rm CO + 2NH}_{\rm 3} \to {\rm CO(NH}_{\rm 2})_2 + {\rm H}_{\rm 2}.$$\end{document} Die einzelnen Reaktionsvorgänge werden quantitativ untersucht und das [Mn(CO)3(NH3)3]+-Kation analytisch, IR-spektroskopisch und magnetisch charakterisiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 349 (1967), S. 251-257 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The anionic structures of the cyanocarbonylmanganates(+I) K2[Mn(CO)3(CN)3] and K3[Mn(CO)2(CN)4], the preparations of which are described, are discussed on the basis of their IR-spectra and force constants, and compared with the structures of the isoelectronic cyanocarbonylchromates(0).
    Notes: Die Strukturen der beiden Cyanocarbonylmanganate(+I) K2[Mn(CO)3(CN)3] und K3[Mn(CO)2(CN)4], deren Darstellung beschrieben wird, werden an Hand ihrer IR-Spektren und Kraftkonstanten diskutiert und mit denjenigen der isoelektronischen Cyanocarbonylchromate(0) verglichen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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