Laser-induced fluorescence detection strategies for sodium atoms and compounds in high-pressure combustors

Journal Article · Tue Jul 20 00:00:00 EDT 1993 · Applied Optics; (United States)

DOI:https://doi.org/10.1364/AO.32.004066· OSTI ID:6321027

Weiland, K J.R. ^[1]; Wise, M L ^[2]; Smith, G P ^[3]

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1. Formerly with the Molecular Physics Laboratory, SRI International, Menlo Park, California 94025 (United States) now with the NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135 (United States)
2. Formerly with the Molecular Physics Laboratory, SRI International, Menlo Park, California 94025 (United States) now with the Department of Chemistry, University of Colorado, Boulder, Colorado 80309 (United States)
3. Molecular Physics Laboratory, SRI International, Menlo Park, California 94025 (United States)

A variety of laser-induced fluorescence schemes were examined experimentally in atmospheric pressure flames to determine their use for sodium atom and salt detection in high-pressure, optically thick environments. Collisional energy transfer plays a large role in fluorescence detection. Optimum sensitivity, at the parts in 10[sup 9] level for a single laser pulse, was obtained with the excitation of the 4[ital p]--3[ital s] transition at 330 nm and the detection of the 3[ital d]--3[ital p] fluorescence at 818 nm. Fluorescence loss processes such as ionization and amplified spontaneous emission were examined. A new laser-induced atomization/laser-induced fluorescence detection technique was demonstrated for NaOH and NaCl. A 248-nm excimer laser photodissociates the salt molecules present in the seeded flames prior to atom detection by laser-induced fluorescence.

• DOE Contract Number: AC21-87MC24012
• OSTI ID: 6321027
• Journal Information: Applied Optics; (United States), Vol. 32:21; ISSN 0003-6935
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COAL GAS
QUANTITATIVE CHEMICAL ANALYSIS
FLUORESCENCE SPECTROSCOPY
SODIUM CHLORIDES
SODIUM HYDROXIDES
EXCIMER LASERS
FLAMES
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CHLORIDES
CHLORINE COMPOUNDS
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EMISSION SPECTROSCOPY
FLUIDS
GAS LASERS
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
LASERS
METALS
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PYROLYSIS PRODUCTS
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010404* - Coal
Lignite
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400102 - Chemical & Spectral Procedures