Integrated absorption coefficients for several vibration-rotation transitions of the gas-phase hydroxyl radical using a tunable diode laser

Technical Report · Tue Sep 01 04:00:00 EDT 1981

OSTI ID:5956609

Podolske, J R

Integrated absorption coefficients for several vibration-rotation transitions of the gas phase OH radical have been measured for the first time. The rate constant for the electronic energy transfer reaction between the excited oxygen molecule, O/sub 2/(/sup 1/..delta../sub g/), and the ground state HO/sub 2/ radical has also been measured. The molecular modulation technique was combined with high resolution diode laser spectroscopy to observe four OH transitions near 3410 cm/sup -1/. Hydroxyl radicals were produced by the photolysis of O/sub 3/ at 2537 A in the presence of H/sub 2/O, and their time-dependent concentration calculated by numerical simulation of the complete photochemical system. The narrow linewidth of the diode laser (approx. 3 x 10/sup -4/ cm/sup -1/) allowed direct measurement of the absorption line profiles. Photolysis of O/sub 3/ at 2537 A in a flow system was performed, both with and without H/sub 2/O present, and steady state O/sub 3/ concentrations measured by UV absorption at 3150 A. O/sub 2/(/sup 1/..delta..) is a pried-model for the steel-concrete mixture. Those analyses did show that the required thickness and amount of re-inforcement would be considerable more (1.8 m) than being used till then (1.2 m). In the new PISCES-2DELK code the re-inforcement can be defined as discretent of nonequilibrium carriers.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5956609
• Report Number(s): LBL-13218; ON: DE82001716
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROPEROXY RADICALS
HYDROXYL RADICALS
LASER SPECTROSCOPY
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
SPECTROSCOPY
VIBRATIONAL STATES
WATER