Non-linearity and frequency shifts of nuclear magnetic spin-noise

Martin Nausner, Judith Schlagnitweit, Vilko Smrečki, Xu Yang, Alexej Jerschow, Norbert Müller

Research output: Contribution to journalArticlepeer-review


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 1H 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.

Original languageEnglish (US)
Pages (from-to)73-79
Number of pages7
JournalJournal of Magnetic Resonance
Issue number1
StatePublished - May 2009


  • Nyquist noise
  • Radiation damping
  • Sensitivity
  • Spin-noise
  • Tuning

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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