title: Non-linearity and frequency shifts of nuclear magnetic spin-noise.
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.
authors.affiliation: Institute of Organic Chemistry, Johannes-Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria.
authors.forename: Martin
authors.initials: M
authors.lastname: Nausner
authors.forename: Judith
authors.initials: J
authors.lastname: Schlagnitweit
authors.forename: Vilko
authors.initials: V
authors.lastname: Smrecki
authors.forename: Xu
authors.initials: X
authors.lastname: Yang
authors.forename: Alexej
authors.initials: A
authors.lastname: Jerschow
authors.forename: Norbert
authors.initials: N
authors.lastname: Müller
mesh_terms: D000465:Algorithms; D003451:Cryoprotective Agents; D004121:Dimethyl Sulfoxide; D009682:Magnetic Resonance Spectroscopy / Q000706:statistics & numerical data*; D017711:Nonlinear Dynamics; D013113:Spin Labels; D013696:Temperature
chemical_list: D003451:Cryoprotective Agents; D013113:Spin Labels; D004121:Dimethyl Sulfoxide