Low‐Magnitude, Pure‐Primary, Hydrogen Kinetic Isotope Effects

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.''