  It is shown that the atomic inversion in the Jaynes-Cummings model has an
exact representation as an integral over the Hankel contour. For a field in a
coherent state, the integral is evaluated using the saddle point method. The
trajectories of saddle points as a function of time are on the branches of the
multi-valued Lambert function. All of them start at the initial moment of time,
but make the maximum contribution to the inversion at different times. If the
collapse and the first revival are clearly distinguished, then subsequent
revivals are determined by the comparable contributions of several
trajectories.
