Near-zero-field nuclear magnetic resonance |
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Authors: | Ledbetter M P Theis T Blanchard J W Ring H Ganssle P Appelt S Blümich B Pines A Budker D |
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Affiliation: | Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA. ledbetter@berkeley.edu |
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Abstract: | We investigate nuclear magnetic resonance (NMR) in near zero field, where the Zeeman interaction can be treated as a perturbation to the electron mediated scalar interaction (J?coupling). This is in stark contrast to the high-field case, where heteronuclear J?couplings are normally treated as a small perturbation. We show that the presence of very small magnetic fields results in splitting of the zero-field NMR lines, imparting considerable additional information to the pure zero-field spectra. Experimental results are in good agreement with first-order perturbation theory and with full numerical simulation when perturbation theory breaks down. We present simple rules for understanding the splitting patterns in near-zero-field NMR, which can be applied to molecules with nontrivial spectra. |
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