As one portion of our combustion diagnostics research program, we are investigating the characteristics of optogalvanic spectroscopy for observing radicals in flames, emphasizing the detection of atomic hydrogen1 and oxygen,2 Recent experiments have demonstrated parts per million sensitivity for detecting both of these very important species. This contribution describes anomalies observed in the behavior of the ionization signal collection efficiency that can have a significant impact on the signal levels measured with optogalvanic spectroscopy.

© 1984 Optical Society of America

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