Abstract
We examine theoretically photoionization processes of molecules component of explosives having at least one explosophore group NO2. We review previous results obtained for the nitramide, N,N-dimethylnitramine and 1,1-diamino-2,2-dinitroethylene (FOX-7 or DADNE) molecules and present new results for the two conformers of nitromethane. A systematization of the results is given. The calculations employed the Symmetry-Adapted-Cluster Configuration Interaction (SAC-CI) ab initio wave function and the monopole approximation to compute photoionization cross sections. Assignments of the ionization bands are provided. The overall agreement between computed spectra, ionization potentials and experiment is very good. We show that the SAC-CI ionization potentials are far superior when compared with Koopmans theorem values and much closer to experimental values.
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Acknowledgments
We thank Faperj, CNPq and Capes, Brazilian Agencies, for support of this work.
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Borges, I., Uhl, E. (2015). Photoionization Spectra and Ionization Potentials of Energetic Molecules. In: Nascimento, M., Maruani, J., Brändas, E., Delgado-Barrio, G. (eds) Frontiers in Quantum Methods and Applications in Chemistry and Physics. Progress in Theoretical Chemistry and Physics, vol 29. Springer, Cham. https://doi.org/10.1007/978-3-319-14397-2_9
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