▎ 摘　　要

It has been shown that sodium atoms deposited on the surface of graphene atop iridium at T a parts per thousand currency sign 850 K diffuse under the graphene layer into an intercalated state and accumulate there in significant concentrations similar to(2-3) x 10(14) atoms cm(-2). The release of the atoms from under the graphene "carpet" takes place upon destruction of the layer at T a parts per thousand yen 1800 K. The physical nature of the differences in the processes of release of atoms of different alkali metals from under graphene has been discussed.