Abstract
The characteristic nuclear-magnetic-resonance parameters, Knight shift, line shape and width, and relaxation times have been measured in cesium metal from the melting point to 1.6\ifmmode^\circ\else\textdegree\fi{}K. The nuclear spin relaxation time ${T}_{1}$ is inversely proportional to the temperature from 300 to 7\ifmmode^\circ\else\textdegree\fi{}K, with ${T}_{1}T=0.135\ifmmode\pm\else\textpm\fi{}0.01$ sec \ifmmode^\circ\else\textdegree\fi{}K. For temperatures below 7\ifmmode^\circ\else\textdegree\fi{}K, the relaxation shows another contribution of unknown origin. The Knight shift increases linearly with temperature down to 4\ifmmode^\circ\else\textdegree\fi{}K, following the line previously measured by Gutowsky and McGarvey at higher temperatures. Diffusion narrowing of the magnetic-resonance line is observed at 190\ifmmode^\circ\else\textdegree\fi{}K, but the strong electron-nucleus interactions preclude good diffusion-constant measurements.
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