Abstract: Results of a calculation valid to all orders in the nuclear-strength parameter Za are presented for the two-loop Lamb shift, notably for the two-loop self-energy correction, for the ground and first excited states of ions with the nuclear charge numbers Z = 60-100. A detailed comparison of the all-order calculation with earlier investigations based on an expansion in the parameter Z[alpha] is given. The calculation removes the largest theoretical uncertainty for the 2pj -2s transition energies in heavy Li-like ions and is important for interpretation of experimental ...

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