The photodissociation of N(2)O is studied by wave packet calculations using a global three-dimensional potential energy surface for the first excited (1)A(') state. It is shown that the weak vibrational structures of the absorption cross section are caused by large-amplitude NN stretch motion, combined with strong excitation of the bend as well as the O-NN stretch. Weakening of the NN bond toward the N+NO channel is the necessary prerequisite.