The ortho−para conversion rate of hydrogen molecules physisorbed on transition metal oxides is shown to be drastically enhanced for selected values of the parameters. This new electron−nucleus resonant mechanism is suggested to interpret the observed accelerations of the conversion rate by an external magnetic field. The sensitivity of the magnetic field acceleration upon catalyst pretreatments might have important practical applications in the selection and preparation of industrial catalysts.
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Paris et al. (1999) studied this question.
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