Abstract
The double-layer interferometer is used to find the anomalous-dispersion curves for the Li, Na and Tl wavelengths 670.8, 589.6, 589.0 and 535.0 nm, respectively, which are excited in the flame. Spectra channelled with the interferometer consist of concentric rings of equal chromatic order whose shape is elliptic and their squared radii are proportional to the interference order. The absorption line divides every ring into two parts. One part expands while the other part collapses. The ring shape is used to deduce the anomalous-dispersion curve which is fitted to the Sellmeier function in order to deduce the effective number of absorbing atoms and the ratio of oscillator strengths for the Na doublet lines.
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