O{sub 2}(a{sup 1{Delta}}) Quenching In The O/O2/O3 System

Journal Article · Fri Oct 08 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3507101· OSTI ID:21426582

Azyazov, V N; Mikheyev, P A ^[1]; Postell, D; Heaven, M C ^[2]

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1. P.N. Lebedev Physical Institute of RAS, Samara Branch, 443011 (Russian Federation)
2. Department of Chemistry, Emory University, Atlanta, GA 30322 (United States)

The development of discharge singlet oxygen generators (DSOG's) that can operate at high pressures is required for the power scaling of the discharge oxygen iodine laser. In order to achieve efficient high-pressure DSOG operation it is important to understand the mechanisms by which singlet oxygen (O{sub 2}(a{sup 1{Delta}})) is quenched in these devices. It has been proposed that three-body deactivation processes of the type O{sub 2}(a{sup 1{Delta}})+O+M{yields}2O{sub 2}+M provide significant energy loss channels. To further explore these reactions the physical and reactive quenching of O{sub 2}(a{sup 1{Delta}}) in O({sup 3}P)/O{sub 2}/O{sub 3}/CO{sub 2}/He/Ar mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of O{sub 2}(a{sup 1{Delta}}) quenching were followed by observing the 1268 nm fluorescence of the O{sub 2}a{sup 1{Delta}}-X{sup 3{Sigma}} transition. Fast quenching of O{sub 2}(a{sup 1{Delta}}) in the presence of oxygen atoms and molecules was observed. The mechanism of the process has been examined using kinetic models, which indicate that quenching by vibrationally excited ozone is the dominant reaction.

• OSTI ID: 21426582
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1278; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DEACTIVATION
DECOMPOSITION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
ENERGY LEVELS
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
FLUORESCENCE
GAS LASERS
IODINE LASERS
KINETICS
LASER RADIATION
LASERS
LOSSES
LUMINESCENCE
MANY-BODY PROBLEM
MIXTURES
MOLECULES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTON EMISSION
QUENCHING
RADIATIONS
REACTION KINETICS
RELAXATION
THREE-BODY PROBLEM