**Acknowledgement**

Support from the U.S. Department of Homeland Security under Award Number 2008-ST-061-ED0001 is also acknowledged. However, the views and conclusions contained in this document are those of the authors and should not be considered a representation of the official policies, either expressed or implied, of the U.S. Department of Homeland Security.

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[8] Hilmi A., Luong J. Micromachined Electrophoresis Chips with Electrochemical Detectors for Analysis of Explosive Compounds in Soil and Groundwater. Environ. Sci.

[9] Yinon J. Trace analysis of explosives in water by gas chromatography—mass spectrometry with a temperature-programmed injector. J. Chromatogr. A. 1996;742(1-2)

[10] Szakal C., Brewer T.M. Analysis and mechanisms of cyclotrimethylenetrinitramine ion formation in desorption electrospray ionization. Anal. Chem. 2009;81(13) 5257-

[11] Miller C.J., Yoder T.S. Explosive Contamination from Substrate Surfaces: Differences and Similarities in Contamination Techniques Using RDX and C-4. Sens. Imaging: An

[12] Pacheco-Londoño L.C., Ortiz-Rivera W., Primera-Pedrozo O.M, Hernández-Rivera S.P. Vibrational spectroscopy standoff detection of explosives. Anal. Bioanal. Chem.

[13] Banas K., Banas A., Moser H.O., Bahou M., Li W., Yang P., Cholewa M., Lim, S.K. Multivariate Analysis Techniques in the Forensics Investigation of the Postblast Residues by Means of Fourier Transform-Infrared Spectroscopy. Anal. Chem. 2010;82(7)

[14] Van Neste C.W., Senesac L.R., Thundat T. Standoff spectroscopy of surface adsorbed

[15] Hildenbrand J., Herbst J., Wollenstein J., Lambrecht A., Razeghi M., Sudharsanan R., Brown G.J. Explosive detection using infrared laser spectroscopy. *Proc. SPIE* 7222(1),

[16] Ortiz-Rivera W., Pacheco-Londoño L.C., Hernandez-Rivera S.P. Remote Continuous Wave and Pulsed Laser Raman Detection of Chemical Warfare Agents Simulants and Toxic Industrial Compounds. Sensing and Imaging: An International Journal 2010;11(3)

[17] Ortiz W., Pacheco L.C., Castro J.R., Felix H., Hernandez-Rivera, S.P. Vibrational spectroscopy standoff detection of threat chemicals. Proc. SPIE Int. Soc. Opt. Eng. 8031:

[18] Castro J.R., Pacheco L.C., Vélez M., Diem M., Tague T.J., Hernandez S.P. Open-Path FTIR Detection of Explosives on Metallic Surfaces. in Fourier Transforms: New Analytical Approaches and FTIR Strategies. G. S. Nikolić, ed. InTech Open, Croatia,

[19] Castro J.R., Pacheco L.C., Vélez M., Diem M., Tague T.J., Hernandez S.P. Passive Mode FT-IR Standoff Detection of Nitroaromatic High Explosives on Aluminum Substrates. (MS No.11-06229R2). Submitted and accepted in Applied Spectroscopy;

Technol. 2000;34(14) 3046-3050.

International Journal 2010;11(2) 77-87.

chemicals. Anal. Chem. 2009;81(5) 1952–1956.

2009;395 (2) 323-335.

3038–3044.

72220B; 2009.

131-145.

2012.

803129; 2011.

978-953-307-232-6; 2011.

205-209.

5266.

This contribution was supported by the U.S. Department of Defense, Proposal Number: 58949-PH-REP, Agreement Number: W911NF-11-1-0152. The authors also acknowledge contributions from Dr. Richard T. Hammond from Army Research Office, DOD.
