Abstract
The orientation dependence of the nuclear-magnetic-resonance linewidth in a single crystal of isotopically pure ${\mathrm{Sn}}^{119}$ has been interpreted in terms of the radial dependence of the pseudodipolar interaction. Lorentzian lines have been observed which are consistent with the existence of exchange narrowing and which, together with supplementary measurements of the second moment of the ${\mathrm{Sn}}^{119}$ resonance in tin of natural isotopic abundance, lead to an estimate of 11\ifmmode\pm\else\textpm\fi{}1 kHz for the strength of the scalar exchange interaction.
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