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Updated: Jun 25, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
Published on: October 9, 2020
Non-linearity and frequency shifts of nuclear magnetic spin-noise
Martin Nausner1, Judith Schlagnitweit, Vilko Smrecki
1Institute of Organic Chemistry, Johannes-Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria.
Abstract:
We have systematically investigated the line shapes observed in proton nuclear spin-noise spectra which depend in a complex way on the properties of the resonance circuit, the number of spins present, transverse relaxation, inhomogeneous broadening, and radiation damping. Using highly sensitive high resolution probes these dependencies are investigated by way of high resolution (1)H noise power NMR spectra of liquid samples. Significant deviations from intuitive expectations are observed. Simulations based on an adapted Nyquist noise equation are used to understand and interpret the experimental findings.
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