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Showing 1 to 10 of 10 for “"quadrupole splitting"”.
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A Mossbauer study of divalent iron in silver chloride crystals
The temperature dependence. of the quadrupole splitting and the quadrupole relaxation rate has been investigated by means of the Mossbauer effect for divalent iron, initially diffused as S7Co into single crystals of silver chloride. The divalent iron ion substitutes for the monovalent silver ion …
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The effect of high pressure on the quadrupole interaction in iron-fluorine compounds
… ions. A detailed analysis was made of the quadrupole pplitting of the Mossbauer spectra for both the ferrous and the ferric salts. The analysis proceeded along two lines: the usual pointcharge approximation and a covalent approximation based upon configuration interaction. Although the …
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High-pressure and high-temperature structural and electronic properties of (Mg,Fe)O and FeO
… for the distribution of the hyperfine parameter quadrupole splitting (D), which provides a key to determining its local structure. It is shown that by analyzing the D distribution, a short-range order parameter could be estimated for the low-Fe (Mg,Fe)O solid solution. Samples quenched from high …
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An NMR Spectroscopy and Density-Functional Theory Study of Organometallic Complexes and Heme Proteins With Carbonyl, Alkylisocyanide, Nitrosoarene and Olefin Ligands: Applications to Structure Determinations
… as the 17O chemical shift, and the 17O nuclear quadrupole coupling constant (NQCC) lead to most probable ligand tilt (tau) and bend (beta) angles of 0°,l° for the Ao-substate when using a Bayesian probability or Z-surface method for structure determination. Results for the A1-substate …
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Solid state and nuclear results from Mössbauer studies with I[superscript 129]
… of the iodates and periodate is 0.61 e. d) The quadrupole splitting of K103 was used to determine the 1129 quadrupole ratio, Q26.8/Qgnd """" 1,23 ± 0.02. The asymmetry of the iodate spectrum and the sign of quadrupole moment show that the sign of the iodate field gradient is negative. The values …
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Understanding the factors which Influence the interactions of iron (II) and iron (III) in porphyrins and the chemistry of silicon phthalocyanine
… Evidence of the nuclear interactions parameter (quadrupole splitting, ΔEQ) was established for the change in the spin state from high spin to the spin admixed S = +/- 3/2, +/- 5/2 state. Furthermore, high-pressure Mössbauer spectroscopy was shown to be a powerful technique to study this kind of …
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Synthesis and characterisation of metal oxides and metal doped variants
… iron-doped zirconia is characterised by a large quadrupole splitting in the <sup>57</sup>Fe Mössbauer spectrum.
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Energy-domain synchrotron radiation Mössbauer source for physics under extreme conditions
… The hyperfine parameters, i.e., centre shift and quadrupole splitting, for the same phases, which were extracted from measured spectra for all perovskite samples studied in this work, are the same at each pressure within experimental error. Moreover, there is no change in Fe3+/ΣFe for individual …
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The Mossbauer effect of FE57 on the surface of tungsten
… of the shape, and the magnitude of the splitting of the two surface lines indicate an electric field gradient at the surface of 2.4 x 10 16 V/cm 2 directed along the normal. An effective Debye temperature of 406 + l2°K is found for the bulk, from a study of the temperature dependence of …
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Electronic structure of transition metal ions and clusters
… suggests that neither the isomer shift nor the quadrupole splitting are strongly influenced by the nature of the coupling between the metal ions, suggesting that broken-symmetry solutions can be used as a basis for computing these parameters in more complex clusters.