Journal article
Photoluminescence spectroscopy of 2-nitrotoluene and its photo and photothermal decomposition derivatives
Journal of photochemistry and photobiology. A, Chemistry, Vol.268, pp.50-57
09/15/2013
Abstract
2-Nitrotoluene (2-NT) is subjected to thermal, photo, and photothermal aging to determine its gas-phase decomposition products via GC/MS. Besides 2-nitrotoluene, the following decomposition products are detected in the gas phase: toluene, 2-nitrosotoluene, 2-cresol, and 2-toluidine. Time resolved laser spectroscopy is used to identify the spectroscopic signatures of these gas-phase products. 2-Nitrotoluene photodissociates during the measurement, leading to the formation of NO and atomic carbon C I, and the observation of their characteristic spectroscopic signatures. Energy transfer between molecular nitrogen and NO is observed. A spectroscopic signature from 2-nitrotoluene in nitrogen with concentrations as low as about 100 ppt is observed. The toluene spectra show a broad emission centered at about 280 nm. The spectroscopic signature of 2-nitrosotoluene is similar to that of 2-NT, and the spectrum is dominated by emission from NO. However, unlike for 2-nitrotoluene, no C I is observed and energy transfer from nitrogen is not apparent. Even with a poorly matched excitation wavelength, the spectrum of 2-cresol shows a strong and broad emission peak centered at about 300 nm, which is promising for the detection of aged 2-nitrotoluene. No useful spectroscopic signatures are seen in the spectra of 2-toluidine. (C) 2013 Elsevier B.V. All rights reserved.
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Details
- Title
- Photoluminescence spectroscopy of 2-nitrotoluene and its photo and photothermal decomposition derivatives
- Creators
- H. Diez-y-Riega - Washington State University SpokaneR. Gunawidjaja - Washington State UniversityH. Eilers - Washington State University Spokane
- Publication Details
- Journal of photochemistry and photobiology. A, Chemistry, Vol.268, pp.50-57
- Academic Unit
- Institute for Shock Physics
- Publisher
- Elsevier
- Number of pages
- 8
- Grant note
- N00014-10-1-0284 / ONR; Office of Naval Research
- Identifiers
- 99900876941101842
- Language
- English
- Resource Type
- Journal article