Nuclear Quadrupole Resonance Under High Pressure, I.

概要

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The nuclear quadrupole resonance frequencies of I^<127> in stannic tetraiodide (SnI_4), As^<75> in arsenolite (As_4O_6), Br^<81> in paradibromobenze (p-C_6H_4Br_2) and in potassium bromate (KBrO_3) were measured as a function of hydrostatic pressure at various temperatures. The pressure range was 1-9000 kg/cm^2 in the temperature range from -77℃ to 100℃, and 1-1000 kg/cm^2 at liquid oxygen temperature, respectively. In general, the pressure and the temperature dependence of the resonance frequency is found to agree with Bayer's theory incorporated with Kushida-Benedek-Bloembergen's theory. It is noticed, however, that an anisotropic change of the internal parameters for the positions of atoms in a unit cell would contribute appreciably to the analysis of the data even in the cases of cubic crystals, SnI_4 and As_4O_6 and that a deviation from the Bayer curve is observed in As_4O_6. Doublet lines for SnI_4 are found to behave differently as a function of voume, and it is concluded for the molecular crystal, As_4O_6 that the effective modes of lattice vibration which are responsible for the temperature dependence of theresonance frequency, are intra-molecular modes rather than a tipping mode of the molecule as a whole.
社団法人日本物理学会の論文
1961-02-05