Nitrogen dioxide fluorescence following photolysis in a supersonic jet
A supersonic jet of N{sub 2}O{sub 4} has been photolyzed at three wavelengths: 193, 248 and 351 nm. The resultant fluorescence of NO{sub 2} was dispersed, and from this the energy distribution of fluorescent NO{sub 2} has been determined by the Photolysis Induced Fluorescence (PIF) scheme. The spread of the energy distribution increased with decreasing photolysis wavelength. The photolysis of NO{sub 2}Cl at 248 nm resulting in NO{sub 2} fluorescence was analyzed by the PIF (Photolysis Induced Fluorescence) deconvolution scheme and these results were compared to and Time-of-Flight/Mass Spectrometry (TOF/MS) performed previously in Y.T. Lee's lab by Oh and Coworkers. The results from the pulsed beam PIF agreed with the TOF/MS results leading to 5 product channels in NO{sub 2}Cl photolysis. The undispersed fluorescence of NO{sub 2} is observed following the excitation of NO{sub 2}Cl, N{sub 2}O{sub 4}, and NO{sub 2}. The Photolysis Induced Fluorescence Excitation (PIFEX) spectrum of NO{sub 2}Cl shows a decrease in the fluorescence quantum yield, {phi}{sub f}, when scanning to shorter wavelength. This decrease in {phi}{sub f} is attributed to the onset of the NO + O + Cl channel. The NO{sub 2} LIF spectra yield information on 3 parallel bands observed near 400 nm as well as a confirmation on D{sub 0}, which is found here to be 3978.3 {plus minus} 0.03 {angstrom} (air-calibrated).
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6735366
- Report Number(s):
- LBL-29112; ON: DE90014164
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
ABSORPTION SPECTRA
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRONIC STRUCTURE
FLUID FLOW
FLUORESCENCE
LUMINESCENCE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
SPECTRA
SUPERSONIC FLOW
WAVELENGTHS