Journal
APPLIED OPTICS
Volume 44, Issue 6, Pages 1084-1091Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.44.001084
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Trace explosive residues are measured in real time by surface laser photafragmentation-fragment detection (SPF-FD) spectroscopy at ambient conditions. A 248-nm laser photofragments the target residue on a substrate, and a 226-nm laser ionizes the resulting NO fragment by resonance-enhanced multiphoton ionization by means of its A-X (0, 0) transitions near 226 nm. We tested two probes on selected explosives and modeled their electric field in the presence of a substrate with an ion optics simulation program. The limits of detection range from 1 to 15 ng/cm(2) (signal-to-noise ratio of 3) at 1 atm and 298 K and depend on the electrode orientation and mechanism for NO formation.
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