Description:
<jats:p>It is shown theoretically that low-magnitude, primary, hydrogen kinetic isotope effects may be characterized by the same types of temperature-dependence irregularities that have been previously shown to be expected fairly commonly for secondary hydrogen isotope effects and primary heavy-atom isotope effects. Upper limits are given for the magnitudes of pure-primary and mixed-primary—secondary hydrogen kinetic isotope effects possibly associated with such temperature-dependence ``anomalies.''</jats:p>