Structural Analysis of Point Defects in Solids

Abstract

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Magnetic resonance investigation of the dynamics of F centers in LiF

“…The spin±lattice relaxation time T 1e is measured by driving the ground state polarization from thermal equilibrium by applying a (saturating) microwave pulse and observing the return of the MCDA to the equilibrium value. The advantage is that the MCDA only depends on the longitudinal magnetization and therefore, only on T 1e (for further details see [10]). Examples of such time evolutions are shown in Fig.…”

Thermal annealing and evolution of defects in neutron-irradiated cubic SiC

“…5). Like to spectra of negatively charged carbon vacancies V C -with the spin S = 1/2 in the polytype 4H-SiC [13], the ratio of intensities of satellite lines for Si 1 and Si [2][3][4] to that of the central line reaches the values 5 and 13%, respectively. The pairs of lines with the splitting similar to those of Si 2-4 lines are also observed both on low-field and high-field wings of the central part in the spectrum belonging mainly to the Ky6 defect.…”

“…Primary defects generated by high-energy particles in binary SiC compounds are vacancies, interstitials, Frenkel pairs and antisites. Comprehensive information concerning the microscopic structure of defects can be extracted using investigations with magnetic resonance techniques like electron paramagnetic resonance (EPR), electron-nuclear double resonance (ENDOR) and optically detected magnetic resonance [3]. As a general rule, in these investigations a tentative model of a defect is based on the analysis of its spin-Hamiltonian parameters, mainly, the fine and hyperfine (HF) structure of EPR spectra.…”

Temperature dependence of absorption in photorefractive iron-doped lithium niobate crystals

“…We assume that thermal vibrations of the crystal lattice induce broadening of the corresponding energy states. 9,10 Two important outcomes of this model are: ͑1͒ on the energy scale, absorption spectra should have a Gaussian shape and ͑2͒ in the ground state as well as in the excited state the electrons can have vibrational thermal energy that decreases or increases the photon energy required for an optical transition.…”