  The electronic energy band spectra of the alkali metal chalcogenides M$_2$A
(M: Li, Na, K, Rb; A: O, S, Se, Te) have been evaluated within the projector
augmented waves (PAW) approach by means of the ABINIT code. The Kohn-Sham
single-particle states have been found in the GGA (the generalized gradient
approximation) framework. Further, on the basis of these results the
quasiparticle energies of electrons as well as the dielectric constants were
obtained in the GW approximation. The calculations based on the Green's
function have been originally done for all the considered M$_2$A crystals,
except Li$_2$O.
