ACCUMULATIVE TRANSFER OF TRANSVERSE MAGNETIC-MOMENT BETWEEN SPIN-LOCKED RB AND CS ATOMS

We propose an efficient method of collisional transfer of transverse m agnetic moment between different kinds of atoms using the spin-locking technique. Demonstrating experiments with a rotating or an oscillatin g rf field are carried out on a Rb-85-Cs-133 vapor, and the transfer o f a large amount of the transverse magnetic moment is observed when th e amplitude H-1 of the rf field is comparable to the static magnetic f ield strength H-0. The H-1-dependence of the transfer, in the case of the oscillating rf field, is not simple, because of the Bloch-Siegert shift and associated resonance effects. The transfer of the transverse magnetic moment under the strong rf field is numerically analyzed wit h the Bloch equations for Rb-85 and Cs-133 coupled through spin-exchan ge collisions.