Kinetics of light emission from excited states of molecular iodine produced in the pulse radiolysis of gaseous argon--iodine mixtures. [20-1000 ns after radiolysis with 10/sup -8/-s pulses]
Journal Article
·
· J. Phys. Chem.; (United States)
- Univ. of Melbourne
Light emission from molecular iodine has been studied in the time regime of ca. 20-1000 ns following the radiolysis of argon-iodine systems with 10/sup -8/-s pulses. Several emission maxima were observed in the 280-530-nm region, corresponding to emission from known excited states of molecular iodine. The temporal characteristics of the emission are independent of wavelength; the intensity of the emission at 342 nm is the greatest by a factor of about 300. Detailed kinetic studies of the emission at 342 nm show that the emitting state is produced as a result of a sequence of ionic reactions, as well as by a nonionic sequence. The fact that the emission spectrum is the same for both sequences indicates a common precursor of the emitting state. Furthermore, the independence of the kinetics on wavelength indicates that the precursor must be common to all of the emitting states of I/sub 2/. A mechanism is suggested which involves the production of excited iodine atoms and subsequent energy transfer to I/sub 2/. These results are relevant to the current interest in the 342-nm emission band as a laser.
- OSTI ID:
- 7343057
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 80:19; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400600* -- Radiation Chemistry
ARGON
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HALOGENS
IODINE
IRRADIATION
KINETICS
NONMETALS
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RARE GASES
REACTION KINETICS
SPECTRA
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400600* -- Radiation Chemistry
ARGON
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HALOGENS
IODINE
IRRADIATION
KINETICS
NONMETALS
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RARE GASES
REACTION KINETICS
SPECTRA