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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 30 — Oct. 20, 1999
  • pp: 6447–6454

Laser photofragmentation–fragment detection and pyrolysis–laser-induced fluorescence studies on energetic materials

Vaidhianat Swayambunathan, Gurbax Singh, and Rosario C. Sausa  »View Author Affiliations


Applied Optics, Vol. 38, Issue 30, pp. 6447-6454 (1999)
http://dx.doi.org/10.1364/AO.38.006447


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Abstract

Trace concentrations of energetic materials such as 2,4,6-trinitrotoluene (TNT), pentaerythritol tetranitrate (PETN), and hexahydro-1,3,5-trinitro-s-triazine (RDX) are detected by laser photofragmentation–fragment detection (PF–FD) spectrometry. In this technique, a single laser operating near 227 nm photofragments the parent molecule and facilitates the detection of the characteristic NO fragment by means of its A2Σ+X2Π (0, 0) transitions near 227 nm. Fragment detection is accomplished by resonance-enhanced multiphoton ionization with miniature electrodes and by laser-induced fluorescence (LIF) with a photodetector. Experiments are also conducted in the visible region by use of 453.85-nm radiation for photofragmentation and fragment detection. Sand samples contaminated with PETN and RDX are analyzed by a pyrolysis–LIF technique, which involves pyrolysis of the energetic material with subsequent detection of the pyrolysis products NO and NO2 by LIF and PF–LIF, respectively, near 227 nm. The application of these techniques to the trace analysis of TNT, PETN, and RDX at ambient pressure in room air is demonstrated with limits of detection (signal-to-noise ratio, 3) in the low parts-in-109 to parts-in-106 range for a 20-s integration time and 10–120 µJ of laser energy at 226.8 nm and ∼5 mJ at 453.85 nm. An increase in detection sensitivity is projected with an increase in laser energy and an improved system design. The analytical merits of these techniques are discussed and compared with those of other laser-based techniques.

© 1999 Optical Society of America

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(140.3450) Lasers and laser optics : Laser-induced chemistry
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6410) Spectroscopy : Spectroscopy, multiphoton
(350.5130) Other areas of optics : Photochemistry

History
Original Manuscript: May 3, 1999
Revised Manuscript: July 14, 1999
Published: October 20, 1999

Citation
Vaidhianat Swayambunathan, Gurbax Singh, and Rosario C. Sausa, "Laser photofragmentation–fragment detection and pyrolysis–laser-induced fluorescence studies on energetic materials," Appl. Opt. 38, 6447-6454 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-30-6447


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