such an assumption has been made, then the expectation values of different properties provide us with useful information which has a direct physical sense. However, at this moment we do not have reliable recipes for calculations of such values, since $a$ $priori$ the ‘power of non-identity’ for the outer most electron is no clear, e.g., in the $4^2S-, 5^2S-$ and $6^2S-$state (see Tables II and III). The power of ‘non-identity’ increases with the excitation, i.e. with the principal quantum number $n$.

On general structure of the bound state spectra
===============================================

The general structure of the bound state spectra in three-electron atoms and ions was considered in our earlier paper [@Bel1]. In this paper by using the energy values obtained in [@Bel1] for the Li atom and the Be$^+$ ion we have drawn the spectral diagrams of these species. For this study we slightly improved numerical values of the total energies and draw the spectral diagrams for the doublet series of the Li atom and the Be$^+$ ion (see Figs. 1 and 2). In particular, the spectra of the Li atom is identical to the experimental spectra given in the classical book [@Kik]. In this work we would like to continue 