Populations of Rydberg levels of atoms in the interstellar medium

Populations of Rydberg levels of atoms are calculated including effects of lowering the atomic ionization potential. Due to these effects the boundary conditions in b n problem is lim b n = 0. The b n factors were computed for T = 100 K. N e = 0.1 cm −3 with b n = 0 when n ≧ 3000. The result allows to interpret observational data of the carbon decametric lines without the use of the subthermal dielectronic recombination mechanism. The calculations predict high relative intensities of C nβ and C nγ lines.