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The temperature dependence of 133 Cs nuclear magnetic resonance in a CsMnCl32H2O single crystal

The nuclear magnetic resonance of 133 Cs in a CsMnCl32H2O single crystal grown by the slow evaporation method has been investigated by employing a Bruker FT NMR spectrometer. The rotation patterns of the 133 Cs NMR spectra were obtained in three mutually perpendicular planes under an applied magnetic field of 4.7 T. From the experimental data, the nuclear quadrupole coupling constant e 2 qQ=h D 321:3 0:1 kHz and asymmetry parameter D 0:301 0:002 are determined at room temperature. The principal axes X; Y , and Z of the EFG tensor for the Cs ion are found to lie along the crystallographic .c C 45/-, .b C 45/-, and a-axes, respectively. The measurement was extended to the temperature range of 120-320 K. The temperature dependence of the quadrupole parameters is roughly explained with a single torsional frequency of the Cs-Cl bond in terms of the simple Bayer theory.