Infrared (1-12 um) atomic and molecular emission signatures from energetic materials using laser induced breakdown spectroscopy

E. Kumi Barimah; U. Hömmerich; E. Brown; C. S.-C. Yang; S. B. Trivedi; F. Jin; P. S. Wijewarnasuriya; A. C. Samuels; A. P. Snyder

doi:10.1117/12.2017913

29 May 2013 Infrared (1-12 μm) atomic and molecular emission signatures from energetic materials using laser-induced breakdown spectroscopy

E. Kumi Barimah, U. Hömmerich, E. Brown, C. S.-C. Yang, S. B. Trivedi, F. Jin, P. S. Wijewarnasuriya, A. C. Samuels, A. P. Snyder

Author Affiliations +

Proceedings Volume 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV; 87100V (2013) https://doi.org/10.1117/12.2017913
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

Laser-induced breakdown spectroscopy (LIBS) is a powerful analytical technique to detect the elemental composition of solids, liquids, and gases in real time. For example, recent advances in UV-VIS LIBS have shown great promise for applications in chemical, biological, and explosive sensing. The extension of conventional UVVIS LIBS to the near-IR (NIR), mid-IR (MIR) and long wave infrared (LWIR) regions (~1-12 μm) offers the potential to provide additional information due to IR atomic and molecular signatures. In this work, a Q-switched Nd: YAG laser operating at 1064 nm was employed as the excitation source and focused onto several chlorate and nitrate compounds including KClO₃, NaClO₃, KNO₃, and NaNO₃ to produce intense plasma at the target surface. IR LIBS studies on background air, KCl , and NaCl were also included for comparison. All potassium and sodium containing samples revealed narrow-band, atomic-like emissions assigned to transitions of neutral alkali-metal atoms in accordance with the NIST atomic spectra database. In addition, first evidence of broad-band molecular LIBS signatures from chlorate and nitrate compounds were observed at ~10 μm and ~7.3 μm, respectively. The observed molecular emissions showed strong correlation with FTIR absorption spectra of the investigated materials.

Citation Download Citation

E. Kumi Barimah, U. Hömmerich, E. Brown, C. S.-C. Yang, S. B. Trivedi, F. Jin, P. S. Wijewarnasuriya, A. C. Samuels, and A. P. Snyder "Infrared (1-12 μm) atomic and molecular emission signatures from energetic materials using laser-induced breakdown spectroscopy", Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 87100V (29 May 2013); https://doi.org/10.1117/12.2017913

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