We investigate the effects of the tensor polarizability of a nucleus on the bound-state energy levels and obtain a general formula for the contribution of the tensor polarizability to the energy levels in two-body bound systems. In particular, it is demonstrated that the tensor polarizability leads to mixing between states with different orbital angular momenta. The effect of tensor polarizability is evaluated for the hyperfine-structure components of $P$ states and for the mixing of $S$ and $D$ states in muonic deuterium.

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• Quantum electrodynamics
• Relativistic & quantum electrodynamic effects in atoms, molecules,& ions
• Tests of fundamental symmetries
• Exotic atoms & molecules
• Muonic atoms & molecules
• Polarizability
• Perturbative methods