title: Transverse atomic motion in transient polarization phenomena.
abstract: We report the observation and explanation of a time-dependent nonexponential photon-echo amplitude decay that is due to transit of atoms out of the excitation laser beam.
authors.forename: J E
authors.initials: JE
authors.lastname: Thomas
authors.forename: R A
authors.initials: RA
authors.lastname: Forber