Fig. 1: The transitions of the M 2S1/2 − 2P1/2 levels.
From: Measurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium
The theoretical 2S and 2P hyperfine splittings are included. F is the quantum number describing the coupling of orbital angular momentum J and nuclear spin I, whereas mF is its magnetic quantum number. The Lamb shift is defined as the difference between the centroid values of the 2S1/2 and 2P1/2 levels.
