Sökning: "ZFS"

Hittade 5 avhandlingar innehållade ordet ZFS.

  1. 1. Spin-Orbit and Spin-Spin Coupling in the Triplet State

    Författare :Sathya Sai Ramakrishna Raj Perumal; Hans Ågren; Ulf Wahlgren; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spin-spin; Spin-Orbit; D and E parameters; ZFS; graphene; TMM; OXA; diradicals; tris 8-hydroxyquinonline aluminium; magnetic anisotropy; magnetism; triplet;

    Sammanfattning : The underlying theory of “Spin” of an electron and its associated inter-actions causing internal fields and spectral shift to bulk-magnetism iswell established now. Our understanding of spin properties is significant andmore useful than ever before. LÄS MER

  3. 2. Combined Quantum Mechanical and Molecular Dynamics study of paramagnetic complexes : Towards an understanding of electronic spin relaxation

    Författare :Shehryar Khan; Michael Odelius; Jozef Kowalewski; Juha Vaara; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; molecular dynamics; quantum chemistry; zero-field splitting; kemisk fysik; Chemical Physics;

    Sammanfattning : The prime objectives of contrast agents in Magnetic Resonance Imaging (MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation originates from dipole-dipole interactions between the nuclear spins and the fluctuating magnetic field induced by unpaired electrons. LÄS MER

  4. 3. An Analysis of NMRD profiles and ESR lineshapes of MRI Contrast Agents

    Författare :Xiangzhi Zhou; Per-Olof Westlund; Jozef Kowalewski; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; MRI contrast agent; MS-325; Spin relaxation; NMRD; ESR; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : To optimize contrast agent in MRI scan region, e.g. to enhance paramagnetic relaxation in the MRI scan fields(0.1T-3T), one possible way is to slow down the tumbling of the paramagnetic complex. LÄS MER

  5. 4. Zero-Field Splitting in Gd(III) complexes : Towards a molecular understanding of paramagnetic relaxation

    Författare :Shehryar Khan; Michael Odelius; Arnold Maliniak; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zero-Field Splitting; Relaxation; Quantum Chemistry; Molecular Dynamics; Gd III ; kemisk fysik; Chemical Physics;

    Sammanfattning : The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation originates from dipole-dipole interactions between the nuclear spins and the fluctuating magnetic field induced by unpaired electrons. LÄS MER

  7. 5. Some aspects of the slow motion problem in the NMR-relaxation theory : a theoretical study of high spin systems

    Författare :Per-Olof Westlund; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : A theory of nuclear spin relaxation in paramagnetic complexes, allowing for the electron spin relaxation to be in the slow motion regime, is presented. The lattice i3 described in terms of the electron Zeeman interaction, a zero field splitting (ZFS) and a Markov operator for the relevant classical degrees of freedom. LÄS MER