As an important secondary explosive, cyclotrimethylenetrinitramine(RDX, C_3H_6O_6N_6) is extensively used in military and industrial applications due to its high energy density and low sensitivity to external stimulations. Considerable attention has been devoted to the study of the detonation initiation, with particular interest in the mechanism by which energy is transferred from a shock wave to the internal molecular vibrations so as to begin endothermic decomposition.During the whole process, phonons as ...