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  • 1965-1969  (11)
  • 1935-1939  (2)
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 201 (1967), S. 368-377 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurement of absorption, luminescence, and relative intensity of cerium and manganese emission during fluorescence, on single crystals of CaF2:(Ce+Mn), have been reported in this paper. The occurence of the absorption bands have been explained in the following manner: (i) 250 mu band due to the transfer transition from F− to2D, the excited state of Ce3+, (ii) 305 mμ band due to the characteristic transition of Ce3+ and (iii) 335 mμ band due to the perturbed level of the lattice. The emission bands have been explained like this, (i) 320 and 340 mμ bands due to the transitions of2D to2F5/2,7/2 levels of Ce3+ (ii) 380 and 440 mμ bands corresponding to the perturbed levels and (iii) 520 mμ band due to transfer of energy from cerium centres to manganese centres. The results of the present investigation indicate that energy transfer in this system occures not only from cerium to manganese centres but also from cerium to cerium and cerium to perturbed levels of the lattice. It has also been observed that energy transfer process is temperature dependent in this case. An energy level scheme is proposed to explain the transfer mechanism.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 209 (1968), S. 254-259 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absoluteK-conversion coefficients of the 496 keV-124 keV cascadeγ-rays in131Cs have been determined from angular correlation experiments using a new approach. The value ofα K =0.0100±0.0007 obtained for the 496 keV transition is in excellent agreement with the theory whereas a strong case is presented for the existence of an anomalous nuclear-structure-dependent conversion coefficient for the 124 keV transition. TheK-conversion coefficient for this transition has been measured to be 0.742±0.077 giving a value of 1.25±0.13 for the ratioα K (expet) /α K (theory) . The result is interpreted as being due to the presence of electric monopole,E0, electron transition. A value of 0.26±0.14 has been obtained for theE0/E2 electron conversion ratio and the absolute value of the electric monopole matrix element has been determined to be 0.07±0.02.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 340 (1965), S. 82-85 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Durch Umsetzung von Aquopenta-cyanorhenaten(II) mit Alkalicyaniden wurden die hexacyanoferrat(II)-analogen Salze K4[ReII(CN)6] · 3 H2O und Na4[ReII(CN)6] · 5 H2O gewonnen, die diamagnetisch und aus deren wäßrigen Lösungen die entsprechenden schwerlöslichen Cu(II)- und Co(II)-Salze auszufällen sind.
    Notes: Preparation of K4ReII(CN)6 · 3 H2O and Na4ReII(CN)6 · 5 H2O analogous to hexacyanoferrates(II) are described. They have been prepared by the treatment of corresponding aquopentacyano-rhenates(II) with alkali cyanides. The insoluble copper and cobalt salts have also been prepared. The hexacyanorhenates(II) are diamagnetic at room temperature.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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