Laser detection of chemical agents
Abstract
We have recently extended the gas-phase MPI technique to probe molecules absorbed on fused quartz surfaces. The phenomenology of the process is rich, showing wavelength-dependent fragmentation patterns. Our first generation surface/mass spectrometer system has a proven detectability limit of 4 less than 4 x 10 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.
- Publication:
-
Stanford Univ. Report
- Pub Date:
- February 1984
- Bibcode:
- 1984stan.rept.....Z
- Keywords:
-
- Detection;
- Laser Applications;
- Mass Spectroscopy;
- Multiphoton Absorption;
- Quartz;
- Dye Lasers;
- Fragmentation;
- Ionization;
- Laser Pumping;
- Methyl Compounds;
- Molecular Ions;
- Partial Pressure;
- Pipes (Tubes);
- Radicals;
- Thermal Blooming;
- Vapor Phases;
- Yag Lasers;
- Lasers and Masers