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  • Electronic Resource  (3)
  • 1970-1974  (3)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Mössbauer studies and nuclear quadrupole moments of186, 188, 189, 190 Os (1972)
    Springer
    The European physical journal 254 (1972), S. 112-126 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer transmission experiments with the 137, 155, 69 and 187 keV gamma rays of186, 188, 189, 190Os, respectively, yielded the electric quadrupole splitting of these gamma resonance lines in OsO2 and OsP2. From the results the following ratios of quadrupole moments were derived:Q 2 +(186Os, 137 keV):Q 2 +(188Os, 155keV):Q 2 +(190Os, 187 keV):Q 3/2 −(189Os, g.s.)=(+1.100±0.020): 1.0:(+0.863±0.051): (−0.586±0.011) andQ 5/2 −(189Os, 69 keV)/Q 3/2 −(189Os, g.s.)=−0.735 ±0.012. The ratios for180, 188, 190Os are, within their limits of error, in agreement with the expectation of the rotational model, indicating that the pairing-plusquadrupole model calculations of Kumar and Baranger predict too rapid a transition form rotational to vibrational nuclei. Applying this argument to186Os in particular and using the measured ratios, one obtains a set of values for the quadrupole moments themselves, namelyQ 2 + (186Os)=−(1.50 ± 0.10)b,Q 2 +(188Os)=−(1.36± 0.09) b,Q 2 + (190Os)=−(1.18 ± 0.08) b,Q 3/2 −(189Os)=+ (0.80 ± 0.06) b, andQ 5/2 − (189Os)=− (0.59 ± 0.05) b. For the electric field gradient at Os nuclei in Re metal a value ofV zz=−(3.3 ± 0.6) · 1017 V/cm2 was found. A measurement with a magnetically split source yielded δ=+ 0.685 ± 0.025 for theE2/M1 mixing parameter of the 69 keV transition of189Os,g 5/2 −/g 3/2 −=0.895 ± 0.006 for the ratio of theg-factors of the 69 keV state and the groundstate, andH i=−(1135 ± 20) kOe for the hyperfine field at Os nuclei in an iron matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380060
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electric quadrupole and magnetic dipole moments of the first excited 2+ states of186Os and188Os (1970)
    Springer
    The European physical journal 230 (1970), S. 80-88 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectroscopic quadrupole moments and the magnetic dipole moments of the lowest 2+ states in186Os (137 keV) and188Os (155 keV) have been determined by Mößbauer transmission experiments. The electric quadrupole momentsQ 2+(Os 186)=− (1.80±0.22) b andQ 2+(Os 188)=−(1.81±0.24) b as well as their ratioQ 2+(Os 188)/Q 2+(Os 186)=1.00±0.07 within the limits of error agree withB(E2) data, if a comparison on the basis of the rotational model is made. For the g-factors and their ratio g2+(Os 186)=0.281±0.008, g2+(Os 188)=0.305±0.015 andg 2+(Os 188)/g 2+(Os 186)=1.08±0.05 was obtained. All results are compared with recent model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394583
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mössbauer isomer shifts and quadrupole splittings in osmium compounds (1974)
    Springer
    The European physical journal 266 (1974), S. 223-232 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From Mössbauer spectra of the 36.2keV and 69.5keV gamma rays of189Os, isomer shifts and electric quadrupole interactions for a number of chemical compounds of osmium in the oxidation states +8, +6, +4, +3, and +2 were obtained. The results show that the dependence of the isomer shifts on the oxidation state of Os follows the general pattern established for other transition elements like Ru and Ir. A comparison of the isomer shift data with electron densities at the Os nuclei resulting from relativistic self-consistentfield calculations for free Os ions yieldsΔ 〈r2〉 [36 keV]=−2.0 · 10−3 fm2 andΔ 〈r2〉 [69 keV]=−0.13 · 10−3 fm3 for the changes of the mean-square nuclear charge radius of189Os. These values are in qualitative agreement with an interpretation of the low-energy level scheme of189Os in terms of two rotational bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01668844
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    Paper (German National Licenses)
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