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Proceedings Paper

Infrared (1-12 μm) atomic and molecular emission signatures from energetic materials using laser-induced breakdown spectroscopy
Author(s): 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
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Paper 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.

Paper Details

Date Published: 29 May 2013
PDF: 6 pages
Proc. SPIE 8710, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV, 87100V (29 May 2013); doi: 10.1117/12.2017913
Show Author Affiliations
E. Kumi Barimah, Hampton Univ. (United States)
U. Hömmerich, Hampton Univ. (United States)
E. Brown, Hampton Univ. (United States)
C. S.-C. Yang, Battelle Eastern Science and Technology Ctr. (United States)
S. B. Trivedi, Brimrose Corp. of America (United States)
F. Jin, Brimrose Corp. of America (United States)
P. S. Wijewarnasuriya, U.S. Army Research Lab. (United States)
A. C. Samuels, Edgewood Chemical Biological Ctr. (United States)
A. P. Snyder, Edgewood Chemical Biological Ctr. (United States)

Published in SPIE Proceedings Vol. 8710:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIV
Augustus Way Fountain, Editor(s)

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