The hexogen, RDX and cyclotetramethylene-tetranitramine (HMX) are of the strongest explosives known to be classified as secondary explosives. These compounds, and some similar compounds, have N-N and N-O covalent bonds, which appear to be an important factor in their explosive and energetic properties. In this paper, the optimal structures and energies of the RDX and HMX and also the energy and...
