Abstract
A method of determining the cross sections for the quenching of excited metal atoms by molecules and atoms which may be present in flames is described. The method has been applied to the quenching of sodium atoms in the 3
p
2
P
state and the following results (in Å
2
) for the square of the distance between the centres of colliding species, σ
2
, obtained: σ
2
H
2
= 2.87 ± 0.1; σ
2
N
2
= 6.95 ± 0.15; σ
2
CO
= 11.9 ± 0.4; σ
2
CO
2
= 17.0 ± 0.4; σ
2
H
2
O
= 0.5 ± 0.3; σ
2
O
2
= 12.3 ± 0.5; σ
2
Ar
< 0.1; σ
2
He
< 0.1. These cross sections have been measured at temperatures in the range 1400°K to about 1800°K and found to be independent of the temperature. The values for the cross sections are derived from measurements of the fluorescence of sodium in hydrogen-oxygen flame diluted with various other gases. This method is believed to be free of uncertainties due to self-absorption, compound formation, line broadening effects and uncertain velocity distributions. Where values for cross sections have been obtained by other workers they are compared with these results and possible reasons for the discrepancies are discussed.
Reference38 articles.
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4. D em troder W . 1962 Z . P hys. 166 42.
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