The proton nuclear spin-lattice relaxation rate in the molecular ring Fe10 is calculated by linear response theory, starting from the unperturbed eigenvalues and eigenvectors, and introducing dipolar superhyperfine interactions as a perturbation. A strong enhancement of the rate at critical values of the applied magnetic field, recently observed by solid-state NMR at low temperatures, is explained in terms of level crossing between states with \DeltaS\ = 1 and \DeltaM\ = 1.
Theory of Nuclear Magnetic Resonance in the Molecular Ring Fe10 / Cornia, Andrea; A., Fort; M. G., Pini; A., Rettori. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - STAMPA. - 226-230:II(2001), pp. 2009-2011. [10.1016/s0304-8853(00)01092-1]
Theory of Nuclear Magnetic Resonance in the Molecular Ring Fe10
CORNIA, Andrea;
2001
Abstract
The proton nuclear spin-lattice relaxation rate in the molecular ring Fe10 is calculated by linear response theory, starting from the unperturbed eigenvalues and eigenvectors, and introducing dipolar superhyperfine interactions as a perturbation. A strong enhancement of the rate at critical values of the applied magnetic field, recently observed by solid-state NMR at low temperatures, is explained in terms of level crossing between states with \DeltaS\ = 1 and \DeltaM\ = 1.
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