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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

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Raman scattering from flames.

M Lapp, L M Goldman, C M Penney

Science (New York, N.Y.)

|March 10, 1972

Summary

Laser Raman scattering reveals asymmetrical broadening in hydrogen-air and hydrogen-oxygen flames. This technique accurately measures rotational and vibrational excitation temperatures in combustion gases.

Area of Science:

Spectroscopy
Combustion Science
Physical Chemistry

Background:

Understanding flame composition and temperature is crucial for combustion analysis.
Laser Raman scattering provides non-intrusive molecular diagnostics.

Purpose of the Study:

To analyze molecular species in hydrogen-air and hydrogen-oxygen flames using Laser Raman scattering.
To develop a novel method for determining rotational and vibrational excitation temperatures.

Main Methods:

Acquiring Laser Raman scattering spectra from nitrogen, oxygen, and water vapor in flames.
Theoretically fitting experimental spectral profiles.

Main Results:

Observed strong asymmetrical broadening in ground-state and upper-state vibrational bands.

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Successfully applied spectral fitting for temperature determination.

Conclusions:

Laser Raman scattering is effective for analyzing flame species.
The developed technique offers a new approach for precise temperature measurements in flames.