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Title: Shockwave compression and dissociation of ammonia gas

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
OSTI Identifier:
1492678
Report Number(s):
LA-UR-18-29082
Journal ID: ISSN 0021-9606
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 150; Journal Issue: 2; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ammonia, hugoniot, dissociation, gas gun

Citation Formats

Dattelbaum, Dana M., Lang, John M., Goodwin, Peter M., Gibson, Lloyd L., Gammel, William P., Coe, Joshua D., Ticknor, Christopher, and Leiding, Jeffery A. Shockwave compression and dissociation of ammonia gas. United States: N. p., 2019. Web. doi:10.1063/1.5063012.
Dattelbaum, Dana M., Lang, John M., Goodwin, Peter M., Gibson, Lloyd L., Gammel, William P., Coe, Joshua D., Ticknor, Christopher, & Leiding, Jeffery A. Shockwave compression and dissociation of ammonia gas. United States. doi:https://doi.org/10.1063/1.5063012
Dattelbaum, Dana M., Lang, John M., Goodwin, Peter M., Gibson, Lloyd L., Gammel, William P., Coe, Joshua D., Ticknor, Christopher, and Leiding, Jeffery A. Mon . "Shockwave compression and dissociation of ammonia gas". United States. doi:https://doi.org/10.1063/1.5063012. https://www.osti.gov/servlets/purl/1492678.
@article{osti_1492678,
title = {Shockwave compression and dissociation of ammonia gas},
author = {Dattelbaum, Dana M. and Lang, John M. and Goodwin, Peter M. and Gibson, Lloyd L. and Gammel, William P. and Coe, Joshua D. and Ticknor, Christopher and Leiding, Jeffery A.},
abstractNote = {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.},
doi = {10.1063/1.5063012},
journal = {Journal of Chemical Physics},
number = 2,
volume = 150,
place = {United States},
year = {2019},
month = {1}
}

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