The follow information is reproduced from:

"Strachan, A.; van Duin, A. C. T.; Chakraborty, D.; 
Dasgupta, S.; Goddard III, W. A. Phys. Rev. Lett. 
2003, 91, 098301"

"Strachan, A.; Kober, E.; van Duin, A. C. T.; 
Oxgaard, J.; Goddard III, W. A. J. Chem. Phys. 
2005, 122, 054502"

"Zhang, L.; van Duin, A.C.T.; Zybin, S.; 
Goddard, W.A. J. Phys. Chem. B 2009, 113, 10770-10778"

"Zhang, L.; Zybin, S.; van Duin, A.C.T.; Dasgupta, S.; 
Goddard, W.A.; Kober, E. J. Phys. Chem. A. 2009, 
113, 10619-10640"

- The parameters of the nitramine ReaxFF are based 
on a large number of ab initio QM calculations. 
Over 40 reactions and over 1600 equilibrated molecules 
have been used; they are designed to characterize 
the atomic interactions under various environments 
likely and unlikely high energy each atom can encounter. 
The training set contains bond breaking and compression 
curves for all possible bonds, angle and torsion bending 
data for all possible cases, as well as crystal 
data.

- Please see the supplemental material from 
Phys. Rev. Lett. 2003, 91, 098301 
for a detailed description of the 
parameterization of this force field.