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Abstract The anomalous dispersion is used i n the present work for atomic spectral analysis. A Michelson ir~terLerometer containing the absorbing atorus i n one of its arms is combined vdth a low- powr grating spectrograph. In such a s e t - up the v~irlf;so f t h e ilh~~rpotni ~pectrall i n e kive XleCeFS8FY speCtPo~Ci’&lc.I :.AL.~L. ..-,.-... ~~!~’.-iCi ~.C~UItCil e l e v e l populatioa? of t’lcl:~.; -- tjr,,:i t\ G. LO eie determined. The the~isco mprises t h r e e chapter s . The f i rst chapter is concerned with the derivation of modified dispersion functions. The c h a r a c t e r i s t i c s of these functions are studled from the spectroscopic point of view. It is found that the chromatic bireLringence i n t h e extreme ~iwosf an a b s o r p t i o n p r o f i l e i s a c c e s s i b l e t o observation i f the exper3.mealal procedure is based on observation of the phase retardb’tion inside a df spersive medium r a t h e r than the amplitude attenuation i n the v i c i n i t y of the absorption l i n e . The e f f e c t of the magnetic f i e l d on chromaLic bfrefringence li3 also considered, |