Quantum isotopic effects and reaction mechanisms: the Li+HF reaction

Zero total angular momentum exact quantum probabilities for Li atoms reacti ng with HF and its isotopic variants were calculated at total energy values ranging from threshold up to 0.6 eV. In this way it has been possible to e stimate product distributions as well as the dependence of the reactive pro bability upon orientation and rotational excitation of reactants. Computed values are compared with quantities obtained from the experiment. To estima te the reactive cross section from zero total angular momentum probabilitie s the J-shifting model was adopted.