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Abstract
Parahydrogen conversion has been investigated on Nd 2O 3 and Dy 2O 3 between 77 K and the outgassing temperature. The activity at all temperatures increases with sample outgassing temperature due to improved surface cleanliness. At temperatures above 400 K a chemical mechanism for conversion predominates, whereas below 400 K conversion proceeds by a paramagnetic physical mechanism. Comparative measurements of parahydrogen and orthodeuterium conversion on Nd 2O 3 between 77 and 273 K assist in the interpretation of low temperature activity, and suggest that orthodeuterium conversion is augmented by nuclear quadrupole-electrostatic field interaction.
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