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- W2004178706 abstract "Heteronuclear spin systems in solids have previously been studied by zero-field NMR (I, 2). Inequivalent nuclear spins (e.g., 13C-lH) behave identically to homo- nuclear spins (e.g., ‘H-‘H) except that they can be independently manipulated in high and zero fields (2, 3). In combination with anisotropic liquid crystal solvents, such spin systems often produce interesting and unexpected features in the zero-field NMR spectra. This paper presents the simplest case of an I-S (I = ‘H, S = 13C) spin pair in nematic and smectic liquid crystalline phases, the latter displaying the effects of small asymmetries. A comparison between the high- and zero-field NMR Hamiltonians illustrates a few of the relevant features of heteronuclear spin systems in zero field. For a 13C-‘H pair, the high-field NMR Hamiltonian in a uniaxial phase may be written as %+ffF = -4, - W& - 9(2I&)(3" @default.
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- W2004178706 date "1987-05-01" @default.
- W2004178706 modified "2023-10-12" @default.
- W2004178706 title "Heteronuclear zero-field NMR of liquid crystals" @default.
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- W2004178706 doi "https://doi.org/10.1016/0022-2364(87)90164-8" @default.
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