Nitrogen dioxide fluorescence from N/sub 2/O/sub 5/ photolysis

Journal Article · Mon Dec 15 04:00:00 EST 1986 · J. Chem. Phys.; (United States)

OSTI ID:7251340

Oh, D; Sisk, W; Young, A; Johnston, H

The products of ultraviolet photolysis of N/sub 2/O/sub 5/ are NO/sub 3/ and awavelength dependent mixture of NO/sub 2/, NO/sup *//sub 2/, and NO+O, where NO/sup *//sub 2/ represents one or more excited electronic states of nitrogen dioxide. This NO/sup *//sub 2/ emits the visible fluorescence spectrum of nitrogen dioxide (photolysis induced fluorescence, PIF), and this spectrum was compared with monochromatically excited NO/sub 2/ fluorescence spectra (laser induced fluorescence, LIF). In a series of experiments, dispersed PIF and LIF spectra were measured where reactant pressure was 200 mTorr, delay time was 30 ns, and observation time was 600 ns. According to results obtained by Sugimoto and co-workers, under these conditions the continuous spectrum, which reflects the overall internal energy of NO/sup *//sub 2/, had been little modified by collision, although there was degradation of fine structure. The continuous LIF spectra were fit to an empirical function, and the PIF spectra were shown to be well represented by a linear combination of these mono-energetic excitation spectra. The coefficients of this linear combination plus other considerations were interpreted to give the almost nascent internal energy distribution of the electronically excited nitrogen dioxide molecules produced by N/sub 2/O/sub 5/ photolysis. This non-Boltzmann internal energy distribution indicates that electronically excited nitrogen dioxide is produced in the /sup 2/B/sub 1/ state when N/sub 2/O/sub 5/ is photolyzed.

• Research Organization: Department of Chemistry, University of California and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
• OSTI ID: 7251340
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 85:12; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
EFFICIENCY
ELECTROMAGNETIC RADIATION
FLUORESCENCE
LUMINESCENCE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
QUANTUM EFFICIENCY
RADIATIONS
ULTRAVIOLET RADIATION