The rate of interconversion of ortho and para hydrogen in a solution of paramagnetic ions is calculated. The rate depends on the correlation of the magnetic fields at the two protons, and this is calculated on the basis of a dipolar interaction modulated by rotational and translational motion of the molecule and the ion. The theory is applied to experimental data on conversion caused by lanthanon and transition metal ions, and is used to estimate the radii of first hydration spheres.
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Atkins et al. (1974) studied this question.
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