NMR study of ammonium reorientation motion in NH4Br at high pressure
NMR study of ammonium reorientation motion in NH4Br at high pressure
复制标题
高压 NH4Br 中铵重新取向运动的核磁共振研究
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
B. Savenko
中科院分区：
文献类型：
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作者：
D. Kozlenko;S. Lewicki;J. Wa̧sicki;W. Nawrocik;B. Savenko
测量了多晶溴化铵的自旋晶格弛豫时间T1作为静水压力和温度的函数。得到了NH4+离子重定向活化参数随压力的函数。提出了一种描述铵离子重定向运动的双阱势模型。根据所建立的模型和得到的活化数据，计算了铵离子的振动频率随压力的变化规律，实验与计算结果吻合较好。
Measurements of spin-lattice relaxation time T1 have been performed for polycrystalline ammonium bromide as a function of hydrostatic pressure and temperature. Activation parameters for NH4+ ion reorientation as functions of pressure were obtained. A two-well potential model is proposed for description of ammonium reorientation motion. On the basis of the proposed model and obtained activation data the libration frequency of the ammonium ion as a function of pressure was calculated and good agreement between experiment and calculation was obtained.