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Experiments on state selection and Penning ionisation with fast metastable rare gas atoms

We report the measurement of Rabi-oscillations in the optical pumping of a beam of metastable neon atoms in a three level system with a c.w. dye laser. The laser beam is focussed on the atomie beam, resulting in an interaction time with the laser beam of the order of the spontaneous lifetime of the induced transition. The Rabi-oscillations are measured by velocity resolved analysis of the optically pumped metastable atoms. Adiabatic following is observed when the atoms cross the laser beam outside of the waist, induced by the Doppler shifts due to the curvature of the wavefronts.