Barut, O.A., Bozic, M. and Maric, Z. (1992) Annals of Physics, 214, 53-83.
http://dx.doi.org/10.1016/0003-4916(92)90061-P

has been cited by the following article:

• TITLE: The Spinning Period of a Free Electron and the Periods of Spin and Orbital Motions of Electron in Atomic States

  AUTHORS: Ziya Saglam, Mesude Saglam, S. Burcin Bayram, Tim Horton

  KEYWORDS: Electron Spin, Landé-g Factor, Magnetic Top Model, Spinning Period, Atto-Seconds Processes

  JOURNAL NAME: Journal of Modern Physics, Vol.6 No.15, December 29, 2015

  ABSTRACT: The spinning period for a free electron and the periods of spin and orbital motion of the electron in an atomic state have been calculated. We have shown that for a free electron the spinning period is: (Ts)free=1.9×10-20s. But in the atomic case we show that, both the spin and the orbital periods depend on the quantum numbers n, ml, ms and the effective Landé-g factor, g* which is a function of the quantum number l of the atomic state given in Dirac notation. We have also calculated these periods for the ground state and some excited states—hydrogen and hydrogen-like atoms. For atomic states the approximate values of spinning period are and the related orbital periods are: (T0)atomic=(10-16-10-15)s. Therefore atto-second processes which are related to the pulse of 10-18 s will filter the orbital motion of the electron but will be long enough to detect the details of the spin motion, such as flip-flops.