A recently developed wavepacket method is applied to study the quantum dyna
mics of the reactions O(D-1) + H-2 --> OH + H and O(D-1) + HD --> OH(OD) D(H). The ab initio based, global, 1A' potential energy surface of Ho et al
. is employed. The results of three-dimensional, total angular momentum J=0
scattering calculations are presented and discussed, with emphasis on qual
itative features of the dynamics.