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Proceedings Paper

Laser photofragmentation/fragment detection studies on energetic materials
Author(s): V. Swayambunathan; Gurbax Singh; Rosario C. Sausa
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Paper Abstract

A sensitive technique based on laser photofragmentation/fragment detection spectrometry is reported for the trace detection of energetic materials such as TNT, PETN, and RDX. A single laser operating near 227 nm is used for both the photofragmentation of the parent molecule and detection of the characteristic NO fragment via its A-X transitions near 227 nm. The fragment detection methods employed are resonance-enhanced multiphoton ionization with miniature electrodes and laser-induced fluorescence with a photodetector. Experiments are also conducted in the visible region using 454-nm radiation for photofragmentation and fragment detection. The application of this technique in the trace analysis of the above- mentioned compounds at ambient pressure is demonstrated with limits of detection in the range of sub- to low parts-per- million for a 20-sec integration time and 20-120 (mu) J of laser energy at 227 nm and approximately 5 mJ at 454 nm. An increase in detecting sensitivity is projected with an increase in laser energy and an improved system design.

Paper Details

Date Published: 22 January 1999
PDF: 9 pages
Proc. SPIE 3535, Advanced Sensors and Monitors for Process Industries and the Environment, (22 January 1999); doi: 10.1117/12.337464
Show Author Affiliations
V. Swayambunathan, U.S. Army Research Lab. (United States)
Gurbax Singh, Univ. of Maryland/Eastern Shore (United States)
Rosario C. Sausa, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 3535:
Advanced Sensors and Monitors for Process Industries and the Environment
Wim A. de Groot, Editor(s)

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