  The spin dynamics of a hydrogen atom during the passage of a periodic
magnetic structure is discussed. The occupation numbers of the components of
the hyperfine structure are considered as a function of time. The
characteristic low-frequency oscillations are visible, which have a direct
analogue in the effect of nuclear magnetic resonance. An envelope forms of
these oscillations are found using the Krylov-Bogolyubov-Mitropol'skii method.
The dependence of spin dynamics on the parameters of the magnetic structure is
investigated. It is shown that this dependence is very sensitive to the
structure of the magnetic field.
