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Proceedings Paper

Detection of munitions grade g-series nerve agents using Raman excitation at 1064 nm
Author(s): Eric Roy; Phillip G. Wilcox; Soren Hoffland; Ian Pardoe
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Paper Abstract

Raman spectroscopy is a powerful tool for obtaining molecular structure information of a sample. While Raman spectroscopy is a common laboratory based analytical tool, miniaturization of opto-electronic components has allowed handheld Raman analyzers to become commercially available. These handheld systems are utilized by Military and First Responder operators tasked with rapidly identifying potentially hazardous chemicals in the field. However, one limitation of many handheld Raman detection systems is strong interference caused by fluorescence of the sample or underlying surface which obscures the characteristic Raman signature of the target analyte. Munitions grade chemical warfare agents (CWAs) are produced and stored in large batches and typically have more impurities from the storage container, degradation, or unreacted precursors. In this work, Raman spectra of munitions grade CWAs were collected using a handheld Raman spectrometer with a 1064 nm excitation laser. While Raman scattering generated by a 1064 nm laser is inherently less efficient than excitation at shorter wavelengths, high quality spectra were easily obtained due to significantly reduced fluorescence of the munitions grade CWAs. The spectra of these less pure, but more operationally relevant, munitions grade CWAs were then compared to spectra of CASARM grade CWAs, as well as Raman spectra collected using the more common 785 nm excitation laser.

Paper Details

Date Published: 19 May 2015
PDF: 6 pages
Proc. SPIE 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI, 94550V (19 May 2015); doi: 10.1117/12.2177244
Show Author Affiliations
Eric Roy, Rigaku Raman Technologies, Inc. (United States)
Phillip G. Wilcox, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Soren Hoffland, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Ian Pardoe, EXCET, Inc. (United States)

Published in SPIE Proceedings Vol. 9455:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI
Augustus Way Fountain III, Editor(s)

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