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.
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- ALTADENA:
-
Adiabatic longitudinal transport after dissociation engenders net alignment
- DNP:
-
Dynamic nuclear polarization
- PASADENA:
-
Parahydrogen and synthesis allow dramatically enhanced nuclear alignment
- PHIP:
-
Para-hydrogen induced polarization
- SABRE:
-
Signal amplification by reversible exchange
- SEOP:
-
Spin exchange optical pumping
- SPINOE:
-
Spin polarization induced nuclear Overhauser effect
- SQUID:
-
Superconducting quantum interference device
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© 2011 Springer-Verlag Berlin Heidelberg
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Glöggler, S., Blümich, B., Appelt, S. (2011). NMR Spectroscopy for Chemical Analysis at Low Magnetic Fields. In: Heise, H., Matthews, S. (eds) Modern NMR Methodology. Topics in Current Chemistry, vol 335. Springer, Berlin, Heidelberg. https://doi.org/10.1007/128_2011_304
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DOI: https://doi.org/10.1007/128_2011_304
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