Oscar Paredes Mellone

Stanford Synchrotron Radiation Lightsource

ABSTRACT

Theory and modeling have long preceded experiment in the fundamental physical and chemical kinetic properties of detonation. This technical gap exists because conventional chemical analytic methods are not easily applied to the rapid detonation process within the tumultuous dense bulk of the detonation. X-ray Raman spectroscopy (XRS), a core-level photonin / photon-out hard x-ray technique, emerges as a unique tool to address these fundamental questions. XRS provides bulk sensitivity and allows to investigate absorption edges of low Z elements with hard x-rays, thus avoiding all constraints inherent to UV/soft x-ray spectroscopies. We present X-ray Raman spectra of several high energy explosives measured at the BL-15 beamline of the Stanford Synchrotron Radiation Facility, along with first principle calculations based on the Bethe-Salpeter equation formalism and Density Functional Theory. Some resonances in the near-edge region were analyzed in detail and the corresponding excitonic wavefunctions were plotted. This work is paving the way for dynamic spectroscopy by identifying spectral features in static, undetonated explosives; investigating achievable signal-to-noise intensity with x-ray flux; and eventually investigate possibilities of high q (non-dipole) geometries for this application

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Email: oparedes@slac.stanford.edu