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Anti-Stokes Raman Spectrometry with 1064-nm Excitation: An Effective Instrumental Approach for Field Detection of Explosives

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Abstract:

Anti-Stokes Raman spectra of 28 explosive materials were obtained with 1064-nm excitation using fiber-optic sampling and a dispersive spectrograph equipped with a charge-coupled device (CCD) array detector. By using a silicon CCD detector, anti-Stokes features could clearly be observed for the majority of samples from -250 to -1650 cm-1. Using the fiber-optic probe, spectra were routinely obtained from samples positioned up to twelve meters from the spectrograph within 240 s. The utility of an anti-Stokes correction routine is demonstrated, which routine allowed anti-Stokes spectra measured with 1064-nm excitation to be successfully searched and identified against libraries of Stokes spectra obtained using a Fourier transform (FT) Raman system equipped with a 1064-nm Nd : YAG laser.

Keywords: ANTI-STOKES; COUNTER-TERRORISM; EXPLOSIVES; FIBER OPTIC; LIBRARY SEARCHING; RAMAN SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370204773580266

Affiliations: Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343

Publication date: April 1, 2004

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