Influence of collision energy and reagent vibrational excitation on the stereodynamics of the reaction H + LiH → H2 + Li

► State selected and energy resolved four PDDCSs are presented. ► The distribution function P(θr), P(ϕr) and P(θr, ϕr) are analyzed. ► The rotational alignment parameters of the product are obtained. ► A preference of changing from the “in-plane” to the “out-of-plane” reaction mechanism emerges.