Quantum Electrodynamics

17), the form factor of the electron (Example 5. 8) and the energy shift of atomic levels (Example 5. 5 on the Rosenbluth formula) and the Lamb shift of high-Z atoms (discussed in Example 5. 9 on the energy shift of atomic levels), while the experimental veri cation of the birefringence of the QED vacuum in a strong magnetic eld (Example 7.