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Backs of an electron and principle of a ban of Paulie. When ideas of quantum mechanics were formed, for an explanation of characteristics of line spectra of atoms the hypothesis an electron back was made. The spectroscopy of higher resolution showed that many lines represent doublets which do not manage to be explained, proceeding from the orbital movement of electrons. Especially indicative example – a doublet of yellow lines of sodium 589,0 and 589,6 of nanometer which is accurately divided even by simple spectrometer devices.