ISOTOPE-SELECTED MEASUREMENTS OF THE VELOCITY-CONTROLLED YB ATOMIC-BEAM

We performed isotope-selected velocity distribution measurements of th e Yb atomic beam by a technique based on the optical double resonance spectroscopy. The S-1(0) --> P-1(1) and P-1(1) --> D-1(2) transitions were employed in this scheme. This method enabled precise measurement of the velocity distribution with the isotope selection and a higher r esolution than our previous measurements using only the S-1(0) --> P-1 (1) transition. This technique was applied to the measurement of the Y b atomic beam whose velocity distribution was optically perturbed and compressed by radiation pressure.