Abstract
The energy-level displacements for atomic states of two oppositel-charged nuclear particles due to their strong interactions are related to the parameters of the effective range approximation for the low-energy scattering of these two particles. For s- and p-states, the level shift and width are obtained to third order in A B (scattering length A divided by Bohr radius B). The results are illustrated by a brief discussion of the level shifts and lifetimes of the K − − p and K − − d systems.
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