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The stereodynamics of the reaction H(2S) + NH (υ= 0, 1, 2, 3; j = 0)→N(4S) + H2 are studied using the quasi-classical trajectory method on a double many-body expansion potential energy surface to understand the alignment and orientation of the product molecules in the collision energy range of 2–20 kcal·mol−1. The vibrational– rotational quantum number of the NH molecules is specifically investigated for υ = 0, 1, 2, and 3 and j = 0. The P(θr), P(φr), P(θr , φr), differential cross section [DCS; (2π/ σ)(dσ00/dωt)], and average rotational alignment factor 〈P2(cos θr)〉 are calculated. The stereodynamics results indicate that the reagent vibrational quantum number and initial collision energy significantly affect the distributions of the k–j', k–k'–j' and k–k' vector correlations along with 〈P2(cos θr)〉 . In addition, while DCS is extremely sensitive to the collision energy, it is not significantly affected by the vibrational excitation of the reagents. Keyword: quasi-classical trajectory method, stereodynamics, potential energy surface, vector correlation

REGULAR ARTICLE: Theoretical calculation of vector correlations for the reaction