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  • 1
    Electronic Resource
    Electronic Resource
    Completely asymmetric nuclear quadrupole effects on electron spin echo modulation patterns (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4369-4374 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron spin echo modulation patterns as modified by the presence of a completely asymmetric nuclear qudrupole interaction are evaluated by using a second order perturbation approach. The resulting modulated patterns are analyzed for S=1/2, I=1, and I=5/2 spin systems at different electron–nuclear distances and at different values of the asymmetry parameter. Comparison with the corresponding simulated patterns in the case of axially asymmetric nuclear quadrupole interaction shows remarkable differences both in the period and amplitude of the nuclear modulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451899
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear quadrupole effects on two and three pulse electron spin echo patterns: A first order perturbation approach for nuclear quadrupole interaction only (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4395-4399 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nuclear modulation of electron spin echo signals is evaluated by an approach which handles only the nuclear quadrupole interaction as a perturbation of the eigenvectors and eigenvalues of the nuclear Hamiltonian including nuclear Zeeman and hyperfine terms. The theory is shown in detail for a first order perturbation treatment for both two and three pulse methods. Final formulas are obtained which are valid for any value of the electron–nuclear distance r, thus removing the limit of previous approaches. The modulation envelopes for I=1(2D) and I=5/2 (27A1) nuclear spin systems are critically analyzed at different electron–nuclear distances including possible misalignment between quadrupole and dipolar hyperfine tensors. Comparison with a first order perturbation approach for both hyperfine and nuclear quadrupole interactions as perturbations of the nuclear Zeeman Hamiltonian is made and shows that the exact treatment of the hyperfine interaction considerably reduces the apparent nuclear quadrupole effects on the overall echo modulation envelopes, particularly at small electron–nuclear distances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449056
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