title: Near-zero-field nuclear magnetic resonance.
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.
authors: Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA. ledbetter@berkeley.edu
authors: M P
authors: MP
authors: Ledbetter
authors: T
authors: T
authors: Theis
authors: J W
authors: JW
authors: Blanchard
authors: H
authors: H
authors: Ring
authors: P
authors: P
authors: Ganssle
authors: S
authors: S
authors: Appelt
authors: B
authors: B
authors: Blümich
authors: A
authors: A
authors: Pines
authors: D
authors: D
authors: Budker