Development of Ultrafast Indirect Flash Heating Methods for RDX

Report No. ARL-MR-862
Authors: Nhan C. Dang; Jennifer L. Gottfried; Stephanie M. Piraino; Frank C. De Lucia, Jr.
Date/Pages: February 2014; 18 pages
Abstract: Ultrafast laser techniques enable the observation of material response and dynamic processes with picosecond time resolution during the initial events occurring in explosive initiation. In this memorandum report, we present our progress in the development of experimental methods for measuring the ultrafast thermal behavior of microscale energetic materials, including cyclotrimethylene trinitramine (RDX), under an indirect femtosecond flash heating laser pulse. The femtosecond laser-generated indirect flash heating was combined with imaging analysis of preheated and postheated RDX crystals to compare the sensitivities of RDX crystals with different morphologies, sizes, and shapes to an ultrafast temperature jump. Additionally, ultrafast transient absorption and vibrational coherent anti-Stokes Raman spectroscopy were demonstrated to offer the potential to measure even more details of the molecular thermal response to flash heating in real time. Experimental data from monitoring the responses of RDX and phenylacetylene behind an ultrafast shock front were used to demonstrate the capability of the spectroscopic methods.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2014