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• W1979469365 abstract "A theoretical approach to the description of longitudinal (T1) relaxation in scalar coupled systems of spin 1/2 nuclei at arbitrary magnetic field is developed, which is based on the Redfield theory. The consideration is addressed to field-cycling relaxometry experiments with high-resolution NMR detection, in which the field dependence of T1-relaxation times, the nuclear magnetic relaxation dispersion (NMRD), can be studied for individual spins of the molecule. Our study reveals well-pronounced effects of spin-spin couplings on the NMRD curves. First, coupled spins having completely different high-field T1 times tend to relax at low field with a common relaxation time. Second, the NMRD curves exhibit sharp features at the fields corresponding to the positions of nuclear spin level anticrossings. Such effects of spin-spin couplings show up not only for individual spins but also for the T1-relaxation of the total spin magnetization of the molecule. The influence of spin-spin coupling is of importance as long as the coupling strength J is larger than the inverse T1-relaxation times of the spins. Around J⋅T1=1 there is also a coherent contribution to the relaxation kinetics resulting in an oscillatory component of the kinetic curves. Application of the theory to experimental examples will be described in subsequent publications." @default.
• W1979469365 created "2016-06-24" @default.
• W1979469365 creator A5068657045 @default.
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• W1979469365 date "2008-12-19" @default.
• W1979469365 modified "2023-10-18" @default.
• W1979469365 title "High resolution NMR study of T1 magnetic relaxation dispersion. I. Theoretical considerations of relaxation of scalar coupled spins at arbitrary magnetic field" @default.
• W1979469365 cites W189699749 @default.
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• W1979469365 doi "https://doi.org/10.1063/1.3040272" @default.
• W1979469365 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19102544" @default.
• W1979469365 hasPublicationYear "2008" @default.
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