Influence of the Naturally Abundant 17O on the Spin-Lattice Relaxation Time T1ρ of Protons in Ammonium Sulfate
1984 年 53 巻 1 号 p. 59-61
詳細
1984 年 53 巻 1 号 p. 59-61
Proton spin-lattice relaxation times T1 and T1ρ in partially deuterated ammonium sulfate were measured between 357 K and 118 K. The minimum values of T1ρ (2∼4 sec) in the paraelectric phase were attributed to the random modulation of the dipolar interaction between the protons in NHD3+ and the natural abundance of the 17O (0.037%) in SO4−2. The activation energy Ea∼4.1 kcal/mol for the reorientation of SO4−2 was determined.
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