Sökning: "electron spin resonance"

Visar resultat 21 - 25 av 62 avhandlingar innehållade orden electron spin resonance.

  1. 21. Magnetic Resonance Parameters of Radicals Studied by Density Functional Theory Methods

    Författare :Lyudmyla Telyatnyk; KTH; []
    Nyckelord :electronic g-tensor; hyperfine coupling constant; nuclear shielding tensor; spin restricted DFT; restricted-unrestricted appoach;

    Sammanfattning : The recent state of art in the magnetic resonance area putsforward the electron paramagnetic resonance, EPR, and nuclearmagnetic resonance, NMR, experiments on prominent positions forinvestigations of molecular and electronic structure. A mostdifficult aspect of such experiments is usually the properinterpretation of data obtained from high-resolution spectra,that, however, at the same time opens a great challenge forpure theoretical methods to interpret the spectral features. LÄS MER

  3. 22. Magneto-optical studies of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures

    Författare :Daniel Dagnelund; Irina Buyanova; Weimin Chen; Marek Godlewski; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dilute nitrides; DMS; defect; ODMR; optically detected magnetic resonance; spin injection; PLE; photoluminescence excitation; post-growth hydrogenation; heterojunction; Semiconductor physics; Halvledarfysik;

    Sammanfattning : This thesis work aims at a better understanding of magneto-optical properties of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures. The thesis is divided into two parts. The first part gives an introduction of the research fields, together with a brief summary of the scientific results included in the thesis. LÄS MER

  4. 23. 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

  5. 24. Spin-dependent recombination in Ga(In)NAs alloys

    Författare :Yuttapoom Puttisong; Weimin Chen; Irina Buyanova; Qingxiang Zhao; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The abilities to control and manipulate electron spin, especially in semiconductors, lead to many interesting proposals for spin-functional devices in future spintronics and quantum information technology. A key requirement for the success of these proposals is that the spin functionality should be operational at room temperature (RT), which remains as a great challenge. LÄS MER

  7. 25. Spin Properties in InAs/GaAs Quantum Dot based Nanostructures

    Författare :Jan Beyer; Weimin Chen; Irina Buyanova; Hongqi Xu; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Semiconductor quantum dots (QDs) are a promising building block of future spin-functional devices for applications in spintronics and quantum information processing. Essential to the realization of such devices is our ability to create a desired spin orientation of charge carriers (electrons and holes), typically via injection of spin polarized carriers from other parts of the QD structures. LÄS MER