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NMR spectroscopy for chemical analysis at low magnetic fields.

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Glöggler,  S.
Research Group of NMR Signal Enhancement, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Glöggler, S., Blümich, B., & Appelt, S. (2013). NMR spectroscopy for chemical analysis at low magnetic fields. In H. Heise, & S. Matthews (Eds.), Modern NMR Methodology. Berlin/Heidelberg: Springer Verlag. doi:10.1007/128_2011_304.


Cite as: http://hdl.handle.net/21.11116/0000-0000-2C77-A
Abstract
This chapter addresses the limits of low-field NMR spectroscopy for chemical analysis and will answer the question of whether high-resolution NMR spectroscopy for chemical analysis of solutions can be achieved with magnetic fields much lower than 0.1 T without losing the chemical information which at high field is derived from the chemical shift and the indirect spin-spin or J-coupling. The focus is on two major issues. First, the thermal spin population differences given by the Boltzmann distribution are small at low field and so is the signal-to-noise-ratio when starting measurements from thermal equilibrium. Second, the possibility of identifying chemical groups is explored at low magnetic fields where the chemical shift can usually no longer be resolved.