Laser Detection of Chemical Agents.
Abstract
The laser multiphoton ionization (MPI) technique has been used as a probe of molecules adsorbed on a quartz substrate. A detectability limit of less than 4 x 10th to the 13th power molecules of dimethyl methyl phosphonate (DMMP) corresponding to an exposure to a DMMP partial pressure of .0000001 Torr for 1 second has been demonstrated. Efforts to make time-of-flight MPI photoelectron spectroscopy a quantitative tool have proved unsuccessful because of poor energy resolution. Efforts to detect phosphonates through a combination of microcolum high pressure liquid chromatography (HPLC) in conjunction with laser fluorescene detection appear extremely promising. Using coumarin derivatization of the hydrolysis products of a number of common chemical warfare agents it has been possible to detect less than 1 picomole each of ethylmethylphosphonic acid, isopropylmethylphosphenic acid, and pinacoylmethylphosphonic acid. Originator-supplied keywords include: Chemical analysis, Phosphonates, Multiphoton ionization, Photoelectron spectroscopy, HPLC.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 12, 1984
- Accession Number
- ADA150093
Entities
People
- R. N. Zare
Organizations
- Stanford University