Shockwave compression and dissociation of ammonia gas

Dattelbaum, Dana M.; Lang, John M.; Goodwin, Peter M.; Gibson, Lloyd L.; Gammel, William P.; Coe, Joshua D.; Ticknor, Christopher; Leiding, Jeffery A.

doi:10.1063/1.5063012

Title: Shockwave compression and dissociation of ammonia gas

Journal Article · 13 January 2019 · Journal of Chemical Physics

DOI: https://doi.org/10.1063/1.5063012 · OSTI ID:1492678

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^[1]; Gibson, Lloyd L. ^[1]; Gammel, William P. ^[1];

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We performed a series of plate impact experiments on NH₃ gas initially at room temperature and at a pressure of ~100 psi. Shocked states were determined by optical velocimetry and the temperatures by optical pyrometry, yielding compression ratios of ~5–10 and second shock temperatures in excess of 7500 K. A first-principles statistical mechanical (thermochemical) approach that included chemical dissociation yielded reasonable agreement with experimental results on the principal Hugoniot, even with interparticle interactions neglected. Theoretical analysis of reshocked states, which predicts a significant degree of chemical dissociation, showed reasonable agreement with experimental data for higher temperature shots; however, reshock calculations required the use of interaction potentials. Here, we rationalize the very different shock temperatures obtained, relative to previous results for argon, in terms of atomic versus molecular heat capacities.

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Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1492678

Report Number(s):: LA-UR-18-29082

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 2 Vol. 150; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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