文摘
Kinetic isotope effects for He2+ formation are calculated quantum dynamically using high-qualityBorn-Oppenheimer (BO) potentials for two electronic states of He2+ and an accurate treatment of allnonadiabatic BO corrections. The two potentials are coupled only when the helium isotopes are different,and the calculations reveal that this coupling is sufficient to allow the two sets of distinguishable reactants,4He+ + 3He or 3He+ + 4He, to yield He2+ with comparable efficiency over a wide temperature range.Consequently, the potential coupling provides a significant formation rate enhancement for the low isotopicsymmetry reactants, as compared to the symmetrical cases (e.g., 4He+ + 4He or 3He+ + 3He). The computedsymmetry-induced kinetic isotope effects (SIKIEs) are in substantial agreement with the availableexperimental results and represent the first theoretical demonstration of this unusual kinetic phenomenon.Possible application of SIKIE to ozone formation and other chemical systems is discussed.