Journal
CHEMPHYSCHEM
Volume 19, Issue 8, Pages 907-912Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201800008
Keywords
cross-correlation; fast acquisition; multiple-quantum coherence; nuclear spin noise; two-dimensional nuclear magnetic resonance
Funding
- Austrian Science Funds FWF [M1404, I1115-N19]
- European Union through the ERDF INTERREG IV [RU2-EU-124/100-2010, M00146]
- Austrian Science Fund (FWF) [M1404] Funding Source: Austrian Science Fund (FWF)
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A major breakthrough in speed and sensitivity of 2D spin-noise-detected NMR is achieved owing to a new acquisition and processing scheme called double block usage (DBU) that utilizes each recorded noise block in two independent cross-correlations. The mixing, evolution, and acquisition periods are repeated head-to-tail without any recovery delays and well-known building blocks of multidimensional NMR (constant-time evolution and quadrature detection in the indirect dimension as well as pulsed field gradients) provide further enhancement and artifact suppression. Modified timing of the receiver electronics eliminates spurious random excitation. We achieve a threefold sensitivity increase over the original snHMQC (spin-noise-detected heteronuclear multiple quantum correlation) experiment (K. Chandra etal., J. Phys. Chem. Lett. 2013, 4, 3853) and demonstrate the feasibility of spin-noise-detected long-range correlation.
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