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Opt Express. 2010 Mar 15;18(6):5399-406. doi: 10.1364/OE.18.005399.

Noncontact detection of homemade explosive constituents via photodissociation followed by laser-induced fluorescence.

Author information

  • 1Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, MA 02420, USA. cwynn@ll.mit.edu

Abstract

Noncontact detection of the homemade explosive constituents urea nitrate, nitromethane and ammonium nitrate is achieved using photodissociation followed by laser-induced fluorescence (PD-LIF). Our technique utilizes a single ultraviolet laser pulse (approximately 7 ns) to vaporize and photodissociate the condensed-phase materials, and then to detect the resulting vibrationally-excited NO fragments via laser-induced fluorescence. PD-LIF excitation and emission spectra indicate the creation of NO in vibrationally-excited states with significant rotational energy, useful for low-background detection of the parent compound. The results for homemade explosives are compared to one another and 2,6-dinitrotoluene, a component present in many military explosives.

PMID:
20389555
[PubMed - indexed for MEDLINE]
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