Transitions to the ground state in synchrotron radiation: Numerical calculations derived from exact matrix elements

The problem of an electron immersed in a uniform magnetic field is viewed from the framework of the relativistic Dirac theory. Because of the simple mathematical structure of the ground state it is possible to evaluate the first-order transition rates to the ground state λn₀ exactly. Explicit results for λn₀ are given in analytical, tabular, and graphical form for a wide range of physical conditions: electrons in "free fall" (Fairbank experiments) to pulsar emission.