Abstract
We present new gas-phase NMR spectra which relate the resonance frequency of 3He nucleus to the resonance frequency of the proton in tetramethylsilane (TMS). We discuss the dependence of 3He resonance frequency on the density of the solvent gas, and we consider in detail the absolute shielding scales of both nuclei. Finally, we analyse the accuracy of the results, using the relationship between the resonance frequencies, absolute shielding constants and magnetic dipole moments of 1H and 3He nuclei.
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