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NUCLEAR SPIN NOISE IN NMR REVISITED

Retour sur le Bruit de spin nucléaire en RMN

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Abstract

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 linewidth as a function of the transmission line phase, nuclear spin-noise signals appearing as a ``bump'' or 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 comparison 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.
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Dates and versions

cea-01171610 , version 1 (06-07-2015)
cea-01171610 , version 2 (21-08-2015)

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Guillaume Ferrand, Gaspard Huber, Michel Luong, Hervé Desvaux. NUCLEAR SPIN NOISE IN NMR REVISITED. 2015. ⟨cea-01171610v2⟩
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