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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 1992, vol. 71, p. 4323-4325

Order α4R corrections to the fine-structure splitting of positronium P levels

Khriplovich I. B., Milstein A. I., Yelkhovsky A. S.

The order α4R corrections to the fine-structure splitting of positronium P levels are found. The calculation is reduced to the ordinary perturbation theory for the nonrelativistic Schrödinger equation. The perturbation operators have the Breit-type structure and are obtained by calculating on-mass-shell diagrams. The correction found is -0.64 MHz for the 23P0-21P1 energy splitting. © 1993 The American Physical Society.