Atomic Fountain Measurements of Multiple Quantum Transitions in Cesium

An atomic fountain is used to study transitions between the $m_F$ sublevels of the Cs $F=4$ $6S_{1/2}$ ground state in magnetic and electric fields. Flop-in and flop-out transitions are induced by coils surrounding the interaction region with which we can apply rf pulses of arbitrary duration, amplitude, shape, phase, and direction. Results from some of these studies will be presented.