Ultrafast Spectroscopy of Energetic Materials: Toward a Molecular Understanding of Impact Sensitivity

摘要

We have progress to report in three areas: (1) fast vibrational spectroscopy of nanoenergetic material ignition; (2) ultrafast surface spectroscopy; (3) 3D spectroscopy of ultrafast vibrational energy transfer. The original goals of this project have not changed, however we have extended our work to include nanotechnology energetic materials. We developed a fast laser- ignition technique for these materials and have successfully probed the time and space dependence of chemistry of Al+ oxidizer systems. Using vibrational sum-frequency generation (SFG) we have probed the structure of shock fronts with 1.5 Angstrom resolution. With 3D spectroscopy we have studied vibrational energy transfer in water and for the first time we have been able to watch vibrational energy flow across the interface between a molecular nanostructure and its surroundings.