Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 143, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4929783
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Funding
- Agence Nationale de Recherche (project IMAGINE, ANR) [12-IS04-0006]
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The theoretical shapes of nuclear spin-noise spectra in NMR are derived by considering a receiver circuit with finite preamplifier input impedance and a transmission line between the preamplifier and the probe. Using this model, it becomes possible to reproduce all observed experimental features: variation of the NMR resonance line width as a function of the transmission line phase, nuclear spin-noise signals appearing as a bumpor as a dip superimposed on the average electronic noise level even for a spin system and probe at the same temperature, pure in-phase Lorentzian spin-noise signals exhibiting non-vanishing frequency shifts. Extensive comparisons to experimental measurements validate the model predictions, and define the conditions for obtaining pure in-phase Lorentzian-shape nuclear spin noise with a vanishing frequency shift, in other words, the conditions for simultaneously obtaining the spin-noise and frequency-shift tuning optima. (C) 2015 AIP Publishing LLC.
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