We describe a machine learning approach to rapidly tune density functional tight binding models for the description of detonation chemistry in organic molecular materials. Resulting models enable simulations on the several 10s of ps scales characteristic to these processes, with “quantum-accuracy.” We use this approach to investigate early shock chemistry in 3,4-bis(3-nitrofurazan-4-yl)furoxan, a hydrogen-free energetic material known to form onion-like nanocarbon particulates following detonation. We find that the ensuing chemistry is significantly characterized by the formation of large CxNyOz species, which are likely precursors to the experimentally observed carbon condensates. Beyond utility as a means of investigating detonation chemistry, the present approach can be used to generate quantum-based reference data for the development of full machine-learned interatomic potentials capable of simulation on even greater time and length scales, i.e., for applications where characteristic time scales exceed the reach of methods including Kohn–Sham density functional theory, which are commonly used for reference data generation.
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28 April 2021
Research Article|
April 29 2021
Investigating 3,4-bis(3-nitrofurazan-4-yl)furoxan detonation with a rapidly tuned density functional tight binding model
Rebecca K. Lindsey
;
Rebecca K. Lindsey
a)
1
Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
a)Author to whom correspondence should be addressed: [email protected]
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Sorin Bastea
;
Sorin Bastea
1
Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
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Nir Goldman
;
Nir Goldman
1
Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
2
Department of Chemical Engineering, University of California
, Davis, California 95616, USA
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Laurence E. Fried
Laurence E. Fried
1
Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
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a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 154, 164115 (2021)
Article history
Received:
February 16 2021
Accepted:
April 09 2021
Citation
Rebecca K. Lindsey, Sorin Bastea, Nir Goldman, Laurence E. Fried; Investigating 3,4-bis(3-nitrofurazan-4-yl)furoxan detonation with a rapidly tuned density functional tight binding model. J. Chem. Phys. 28 April 2021; 154 (16): 164115. https://doi.org/10.1063/5.0047800
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