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Updated: Apr 14, 2026

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
Published on: November 7, 2017
Heteronuclear J-coupling measurements in grossly inhomogeneous magnetic fields
1Case Western Reserve University, Cleveland, OH 44106, USA; Schlumberger-Doll Research, Cambridge, MA 02139, USA.
Abstract:
It is difficult to measure chemical shifts in the small and inhomogeneous magnetic fields found in ex situ and single-sided NMR systems, such as those used for well-logging. However, it is still possible to obtain chemical information from J-coupling constants, which are independent of static field strength and temperature. We describe and analyze (1)H-(13)C double-resonance pulse sequences that are suitable for measuring heteronuclear J-coupling in grossly inhomogeneous fields. We also present preliminary experimental results from a low-frequency fringe-field system.
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