Interpreting the near infrared region of explosives

Félix Zapata; Marta Ferreiro-González; Carmen García-Ruiz

doi:10.1016/j.saa.2018.06.002

Interpreting the near infrared region of explosives

Spectrochim Acta A Mol Biomol Spectrosc. 2018 Nov 5:204:81-87. doi: 10.1016/j.saa.2018.06.002. Epub 2018 Jun 7.

Authors

Félix Zapata¹, Marta Ferreiro-González², Carmen García-Ruiz³

Affiliations

¹ Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering and Police Sciences University Research Institute (IUICP), Universidad de Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain. Electronic address: felix.zapata@uah.es.
² Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz, Agrifood Campus of International Excellence (ceiA3), IVAGRO, P.O. Box 40, 11510 Puerto Real, Cadiz, Spain. Electronic address: marta.ferreiro@uca.es.
³ Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering and Police Sciences University Research Institute (IUICP), Universidad de Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain. Electronic address: carmen.gruiz@uah.es.

PMID: 29906648
DOI: 10.1016/j.saa.2018.06.002

Abstract

The NIR spectra from 1000 to 2500 nm of 18 different explosives, propellant powders and energetic salts were collected and interpreted. NIR spectroscopy is known to provide information about the combination bands and overtones of highly anharmonic vibrations as those occurring in XH bonds (CH, NH and OH). Particularly intense and complex were the bands corresponding to the first combination region (2500-1900 nm) and first overtone stretching mode (2ν) of CH and NH bonds (1750-1450 nm). Inorganic oxidizing salts including sodium/potassium nitrate, sodium/potassium chlorate, and sodium/potassium perchlorate displayed low intense or no NIR bands.

Keywords: Combination region; Energetic powders; Explosives; Near infrared spectroscopy; Overtone.