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    Wyświetlanie 1-3 z 3
    Tytuł:
    Higher - order field - dependent terms in spin Hamiltonians for transition ions : implications for high - magnetic field and high - frequency EMR measurements
    Autorzy:
    Rudowicz, Cz.
    Powiązania:
    https://bibliotekanauki.pl/articles/148384.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron magnetic resonance (EMR)
    high-magnetic field and high-frequency EMR (HMF-EMR)
    generalized spin Hamiltonians (GSH)
    higher-order field-dependent (HOFD) terms
    zero-field splitting (ZFS) terms
    transition ions in crystals
    Opis:
    An overview of theoretical background of the higher-order field-dependent (HOFD) terms in the generalized spin Hamiltonians for transition ions and current status of experimental studies of the HOFD terms is provided in the nutshell. The terms nonlinear in the magnetic field (B) of the type: B2S2, B3S, B5S or B2I2, B3I, B5I, where S and I is the electronic and nuclear spin, respectively, are of particular importance as compared with the usual linear Zeeman term B.g.S. This is due to the high B values, up to 100 T (pulsed fields), achievable at present in the high-magnetic field and/ or high-frequency electron magnetic resonance (HMF-EMR) measurements of magnetic and spectroscopic properties. A blueprint for future theoretical and experimental studies of the HOFD terms is proposed taking into account their implications for HMF-EMR measurements
    Źródło:
    Nukleonika; 2013, 58, 3; 341-345
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of EMR data for Fe2+(S=2) ions in a [2Fe-2S] cluster in the reduced ferredoxin
    Autorzy:
    Rudowicz, Cz.
    Piwowarska, D.
    Gnutek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146266.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    [2Fe-2S] cluster
    electron magnetic resonance (EMR)
    Fe2+ ions
    microscopic spin Hamiltonian (MSH)
    zero field splitting (ZFS) parameters
    Opis:
    The modelling techniques employed in this study utilize structural data to enable correlation of EMR data – described by the spin Hamiltonian (SH) and optical spectroscopy data – described by the crystal field (CF) Hamiltonian. These techniques enable also to predict magnetic and spectroscopic properties of 3dN ions, especially 3d4 and 3d6 ions, in various systems. Specific applications are considered for [Fe2+ and Fe3+] binuclear centres in [2Fe-2S] cluster in the reduced ferredoxin and related biological molecules. The background for model calculations of the zero-field splitting (ZFS) parameters and/or crystal field parameters and the capabilities of the two major techniques used will be presented in the full paper. Here, we present preliminary results of the microscopic spin Hamiltonian (MSH) modelling for Fe2+ (3d6) ions in the reduced ferredoxin.
    Źródło:
    Nukleonika; 2013, 58, 3; 347-350
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians
    Autorzy:
    Rudowicz, Cz.
    Karbowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971531.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal/ligand field (CF/LF) Hamiltonian electron magnetic resonance (EMR)
    magnetism
    optical spectroscopy
    transition (3dN and 4fN) ions
    zero-field splitting (ZFS)
    Opis:
    The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-fi eld splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 377-383
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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