Temperature dependence of the NO/sub 3/ absorption spectrum
The absorption spectrum of the gas-phase NO/sub 3/ radical has been studied between 220 and 700 nm by using both flash photolysis and discharge flow reactors for the production of NO/sub 3/. In the flash photolysis method, cross sections at the peak of the (0,0) band at 661.9 nm were measured relative to the cross section of ClONO/sub 2/ at several different wavelengths. From the best current measurements of the ClONO/sub 2/ spectrum, the NO/sub 3/ cross section at 661.9 nm was determined to be (2.28 +/- 0.34) x 10/sup -17/ cm/sup 2/ molecule/sup -1/ at 298 K. Measurements at 230 K indicated that the cross section increases by a factor of 1.18 at the peak of the (0,0) band. The discharge flow method was used both to obtain absolute cross sections at 661.9 nm and to obtain relative absorption spectra between 300 and 700 nm at 298 and 230 K. A value of (1.83 +/- 0.27) X 10/sup -17/ cm/sup 2/ molecule/sup -1/ was obtained for sigma/sub NO/sub 3// at 661.9 nm at 298 K. Upper limits to the NO/sub 3/ cross sections were also measured between 220 and 260 nm with the discharge flow method.
- Research Organization:
- California Institute of Technology, Pasadena
- OSTI ID:
- 5399209
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 90:17
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
NITROXYL RADICALS
ABSORPTION SPECTROSCOPY
CHLORINE COMPOUNDS
ELECTRIC DISCHARGES
EXPERIMENTAL DATA
FLUID FLOW
MEDIUM TEMPERATURE
PHOTOLYSIS
TEMPERATURE DEPENDENCE
ULTRAVIOLET SPECTRA
VIBRATIONAL STATES
VISIBLE SPECTRA
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ENERGY LEVELS
EXCITED STATES
HALOGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
RADICALS
SPECTRA
SPECTROSCOPY
400201* - Chemical & Physicochemical Properties
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400500 - Photochemistry