We report an experimental observation of coherent population transfer in a multilevel system by adiabatic following through a trapped state. Raman transitions between ground-state sublevels are induced by two partially overlapping o. + polarized laser beams, tuned to the hyperfine transition F =4~F'=4 of the cesium D2 line. An efficiency of more than 50%o is observed for the m+=+4 -+mz= -4 popula-
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