Fiber-optic resonance-enhanced multiphoton ionization probe for in situ detection of aromatic contamination
Journal Article
·
· Applied Spectroscopy
- Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina 29208 (United States)
A simple fiber-optic probe suitable for remote analysis with the use of resonance-enhanced multiphoton ionization has been developed and demonstrated by measuring vapor-phase toluene and gasoline above aqueous solutions. An optical fiber transmits a high-power laser pulse (266 nm or 532 nm) to the sample, ionizing it, and the subsequent ions are collected with a platinum electrode mounted at the fiber tip. Measurements take approximately 100 s to perform, require no sample preparation, and have been demonstrated over a distance of five meters. The limit of detection for toluene in water with the use of this probe is 1.47{+-}0.02 ppb(wt/wt). In addition to two-photon excitation at 266 nm, the feasibility of a 2+2 excitation scheme using 532 nm has also been shown. (c) 1999 Society for Applied Spectroscopy.
- OSTI ID:
- 20216189
- Journal Information:
- Applied Spectroscopy, Journal Name: Applied Spectroscopy Journal Issue: 12 Vol. 53; ISSN 0003-7028; ISSN APSPA4
- Country of Publication:
- United States
- Language:
- English
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