Abstract

Optical cross sections corresponding to spectral lines of Li, Na, K, Ca, Sr, Ba, Tl, Cu, Ag, Cr, Mn, Fe, Co, and Ni, emitted by an acetylene-air flame, have been determined. The evaluation of the cross section is based on intensity-density graphs, constructed from photoelectric measurements of the total line intensities as a function of the density of the emitting atoms in the flame.

When the cross section corresponding to the line has been determined, the measured intensity-density curves yield the absolute values of the product Nf of the number of atoms in the flame capable of absorbing the line, and the oscillator strength for the line. If the f value for the line is known, the degree of dissociation of the element in the flame can be found. If the f value for the line is not known, the product Nf allows, in some cases, the evaluation of the absolute f value for the line; in other cases only a lower limit of the absolute f value can be obtained. The results are compared with those of previous investigators.

© 1957 Optical Society of America

A Method of Determining Optical Cross Sections*†

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