Abstract
A method of measurement of anomalous dispersion near spectral lines of absorption from interference fringe shifts is described. The sensitivity and accuracy of the method is analyzed and its advantage over the hook method is demonstrated. The system consists of Rozhdestvenskii's interferometer and a diffraction grating spectrometer. The device is adapted both to photo and photoelectric recording of the interference fringes. The technique is tested on the first resonance doublet of sodium with the wave lenghts 5890, 5896 Å. For the oscillator strengths ratio ⨍ 5890/⨍ 5896 we get 2.05±0.03.
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