DTIC ADA481354: A Laser Based Explosives Sensor pdf

DTIC ADA481354: A Laser Based Explosives Sensor

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Trace explosives residues of CL20 (hexanitrohexazaisowurtzitane) and RDX (hexahydro-1,3,5-hexanitro-1,3,5-triazine) are measured in real-time by surface laser photofragmentation-fragment detection (SPFFD) 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 investigate the effects of laser wavelength and energy, delay between photofragmentation and ionization lasers, and residue concentration on signal intensity. A signal-to-noise analysis yields a limit of detection of 7.1 ng/cm2 for CL20 and 1.4 ng/cm2 for RDX at 1atm and 298K

• Creator/s: Defense Technical Information Center
• Date: 11/1/2006
• Year: 2006
• Book Topics/Themes: DTIC Archive, Sausa, Rosario C, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *EXPLOSIVES DETECTION, SYMPOSIA, REAL TIME, IONIZATION, VAPOR PRESSURE, LASER SPECTROSCOPY, RDX, RESIDUES, PHOTOFRAGMENT SPECTROSCOPY, ULTRAVIOLET LASERS

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