Time-resolved fluorescence investigation of rotational transfer in A/sup 2/summation/sup +/ (v = 0) OH
Journal Article
·
· Appl. Opt.; (United States)
Rotational transfer cross sections for the OHA/sup 2/Zeta/sup +/(v = O) rovibronic levels were determined for collisions with water vapor at flame temperatures. OH fluorescence was introduced by a 10-ns pulse from a Nd:YAG- pumped dye laser, and the resulting fluorescence spectrum was recorded at selected times during the laser pulse. The measurements were performed in the postflame region of 30-Torr stoichiometric hydrogen/oxygen/nitrogen flames. Four different upper rotational levels were excited. State-to-state and total rotational transfer rates were calculated by optimizing the agreement between experimental spectra and synthetic spectra generated by a time-dependent numerical code. For the F/sub 1/(1), F/sub 1/(4), F/sub 2/(5), and F/sub 1/(10) upper rotational levels in the A/sup 2/Zeta/sup +/(v = 0) manifold, total rotational transfer cross sections were found to be (110 +- 30), (170 +- 60), (190 +- 60), and (110 +- 30) x 10/sup -16/ cm/sup 2/, respectively, for collisions of OH with water vapor.
- Research Organization:
- Predue University, School of Mechanical Engineering, Flame Diagnostics Laboratory, West Lafayette, Indiana 47906
- OSTI ID:
- 6994535
- Journal Information:
- Appl. Opt.; (United States), Journal Name: Appl. Opt.; (United States) Vol. 25:22; ISSN APOPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
COLLISIONS
COMBUSTION PROPERTIES
DIAGNOSTIC TECHNIQUES
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLAMES
FLUIDS
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GASES
HYDROGEN
HYDROXYL RADICALS
LASER SPECTROSCOPY
LUMINESCENCE
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN
NONMETALS
OXYGEN
RADICALS
RESOLUTION
ROTATIONAL STATES
SPECTROSCOPY
TIME RESOLUTION
TIMING PROPERTIES
VAPORS
WATER VAPOR
400102 -- Chemical & Spectral Procedures
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
COLLISIONS
COMBUSTION PROPERTIES
DIAGNOSTIC TECHNIQUES
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLAMES
FLUIDS
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GASES
HYDROGEN
HYDROXYL RADICALS
LASER SPECTROSCOPY
LUMINESCENCE
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN
NONMETALS
OXYGEN
RADICALS
RESOLUTION
ROTATIONAL STATES
SPECTROSCOPY
TIME RESOLUTION
TIMING PROPERTIES
VAPORS
WATER VAPOR