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 ( coupling). This is in stark contrast to the high-field case, where heteronuclear 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.
- Received 13 June 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.107601
© 2011 American Physical Society
Synopsis
Magnetic scans with a tiny magnet
Published 1 September 2011
To complement normal NMR spectroscopy performed in high magnetic fields, researchers are developing a technique that works in nearly zero fields.
See more in Physics