Relaxation processes in water. A study of the proton spin‐lattice relaxation time
Relaxation processes in water. A study of the proton spin‐lattice relaxation time
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水中的弛豫过程。质子自旋晶格弛豫时间的研究。
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
M. Wood
中科院分区：
文献类型：
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作者：
J. Hindman;A. Svirmickas;M. Wood
在−16 ° C至145°C的温度区间内，对H2O的质子自旋晶格弛豫时间T1进行了实验研究。结果表明，在对自旋-转动相互作用进行修正后，四极核2 H和17 O在水中的弛豫速率表达式可以用双指数形式表示.氧-17数据用于计算质子T1的分子内贡献。分子间弛豫的两个贡献的活化能E1=9.4± 0.8 kcal/mole和E2=3.6± 0.1 kcal/mole与分子内弛豫的活化能相当一致，表明两种情况下的弛豫机制是相同的。这一机制涉及两个过程。数据表明，在高温下占主导地位的过程可以被描述为旋转扩散，其中角运动的幅度随着温度的升高而增加。
An experimental study of the proton spin‐lattice relaxation time T1 has been made for H2O over the temperature interval from −16 to 145°C. It is found that after correction for spin‐rotational interaction, the experimental T1 behavior can be represented by the double exponential form of the rate expression used to treat the relaxation for the quadrupolar nuclei 2H and 17O in water. The oxygen‐17 data are used to calculate the intramolecular contribution to the proton T1. The activation energies E1=9.4± 0.8 kcal/mole and E2=3.6± 0.1 kcal/mole for the two contributions to the intermolecular relaxation are in sufficiently good agreement with those for the intramolecular relaxation to indicate that the relaxation mechanism is the same in both cases. This mechanism involves two processes. The data indicate the process dominant at high temperature can be described as a rotational diffusion where the amplitude of angular motion increases with increasing temperature.