Production, excitation, and laser dynamics of sulfur monoxide
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Lawrence Livermore National Lab., CA (United States)
We have investigated the kinetics of excitation and lasing of the free radical SO by rotationally-resolved optical pumping near 250 nm with a continuously-tunable, narrow-line width KrF laser. Longitudinal photodissociation of SO[sub 2] by a 193-nm ArF excimer laser produced SO(X[sup 3][Sigma][sup [minus]]) concentrations close to 10[sup 16] cm[sup [minus]3] over a 50-cm length. Pumping of SO(B[sup 3][Sigma][sup [minus]]) by the KrF laser occurred from the v[double prime] = 2 ground state vibrational level which was preferentially produced by photodissociation. The fraction of ground state population that could be excited to SO(B) was determined by measuring the saturation fluence for excitation as a function of buffer gas pressure and comparing with a simple model. Addition of a buffer gas increased excitation by nearly 30 times due to increased rotational mixing in the ground electronic state. Lasing was demonstrated on six new vibrational bands of fully-allowed SO(B-X) band in the region 262-315 nm. A small-signal gain coefficient of 0.11 cm[sup [minus]1] and pulse energy of 11 [mu]J were achieved on the 270-nm SO(B,v[prime] = 2 [yields] X, v[double prime] = 5) laser transition. A full computational rate equation model of the excitation and lasing dynamics, including collisional rotational mixing, was developed. 58 refs., 20 figs.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6730118
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:44; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
426002 -- Engineering-- Lasers & Masers-- (1990-)
560400 -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DISSOCIATION
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY STORAGE
ENERGY-LEVEL TRANSITIONS
EXCIMER LASERS
EXCITATION
GAS LASERS
GROUND STATES
KRYPTON FLUORIDE LASERS
LASER MATERIALS
LASERS
MATERIALS
MATHEMATICAL MODELS
OPTICAL PUMPING
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PUMPING
RADICALS
STORAGE
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNTHESIS
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
426002 -- Engineering-- Lasers & Masers-- (1990-)
560400 -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DISSOCIATION
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY STORAGE
ENERGY-LEVEL TRANSITIONS
EXCIMER LASERS
EXCITATION
GAS LASERS
GROUND STATES
KRYPTON FLUORIDE LASERS
LASER MATERIALS
LASERS
MATERIALS
MATHEMATICAL MODELS
OPTICAL PUMPING
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PUMPING
RADICALS
STORAGE
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNTHESIS