MAGNETIC COHERENCES IN ATOM INTERFEROMETRY

We have used a separated beam atom interferometer to investigate magne tically-induced phase shifts of the different magnetic substates of th e sodium ground state. We have observed periodic rephasing of the 8 in dependent magnetic substates present in an unpolarized sodium beam as the differential magnetic field is increased on opposite sides of the interferometer. We have also demonstrated that two phase shifts with s imilar velocity dependences can be used to cancel each other, creating an interference pattern from one magnetic substate although an unpola rized beam is sent into the interferometer. Finally we discuss some ap plications of these techniques.