Abstract
In our previous paper1 we have shown for the first time that neglecting of the retardation effects in the spontaneous emission from a two-level atom (dipole approximation) leads to an asymptotic result which differs significantly from that obtained without this approximation. For this reason in the present paper no kind of dipole or rotating-wave approximation (RWA) will be made. This can be achieved by specializing ourselves to the case of Lyman-a transition in a two-level hydrogenic atom.
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