Pump-probe detection of surface-bound organophosphonate compounds
Abstract not provided.
Publications
Pump-probe detection of surface-bound organophosphonate compounds
2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011
We demonstrate a pump-probe approach for the detection of organophosphonate compounds on substrates, in which the pump pulse fragments the parent molecule and the released phosphorous monoxide (PO) fragment is probed using laser-induced fluorescence. © 2011 OSA.
High-Vacuum Time-Resolved Laser-Induced Incandescence of Flame-Generated Soot
Applied Physics B
Abstract not provided.
Two-pulse rapid remote surface contamination measurement
This project demonstrated the feasibility of a 'pump-probe' optical detection method for standoff sensing of chemicals on surfaces. Such a measurement uses two optical pulses - one to remove the analyte (or a fragment of it) from the surface and the second to sense the removed material. As a particular example, this project targeted photofragmentation laser-induced fluorescence (PF-LIF) to detect of surface deposits of low-volatility chemical warfare agents (LVAs). Feasibility was demonstrated for four agent surrogates on eight realistic surfaces. Its sensitivity was established for measurements on concrete and aluminum. Extrapolations were made to demonstrate relevance to the needs of outside users. Several aspects of the surface PF-LIF physical mechanism were investigated and compared to that of vapor-phase measurements. The use of PF-LIF as a rapid screening tool to 'cue' more specific sensors was recommended. Its sensitivity was compared to that of Raman spectroscopy, which is both a potential 'confirmer' of PF-LIF 'hits' and is also a competing screening technology.
Photofragmentation approaches for the detection of polyatomic molecules
Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010
We review three photofragmentation detection approaches, describing the detection of (1) vapor-phase mercuric chloride by photofragment emission, (2) vapor-phase nitro-containing compounds by photofragmentation-ionization, and (3) surface-bound organophosphonate compounds by photofragmentation-laser-induced fluorescence. © 2010 Optical Society of America.
Development of a fieldable real-time mercuric chloride monitor using laser photofragment emission
Abstract not provided.
Developing a laser-based ionization approach for detecting explosives with ion mobility spectrometry
Optics InfoBase Conference Papers
Rotationally resolved resonance-enhanced multiphoton ionization (REMPI) spectra of the NO photofragment from nitrobenzene have been observed for the A 2Σ+-X 2Π (1, 0) transition. These spectra were collected in an atmospheric-pressure nitrogen bath. © 2007 Optical Society of America.
Development of a fieldable real-time mercuric chloride monitor using laser photofragment emission
Abstract not provided.
8 Results