Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 198, Issue 1, Pages 73-79Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2009.01.019
Keywords
Spin-noise; Nyquist noise; Sensitivity; Tuning; Radiation damping
Funding
- FWF (Austrian Science Funds) [P79635-N17]
- OAD (WTZAT-HR)
- US NSF [CHE-0550054]
- Croatian Ministry of Science, Education and Sports [098-0982929-2917]
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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 H-1 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. (C) 2009 Elsevier Inc. All rights reserved.
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