OPTICAL ISOTOPIC SHIFTS AND HYPERFINE SPLITTINGS FOR YB

A cw tunable dye laser and atomic-beam techniques were used to determine the splittings and separations of the natural Yb isotopes for the 5556.5-, P13-S01 transition. The resonant scattering was recorded with an instrumental resolution of 7 MHz full width at half-maximum, giving peak separations accurate to 0.5 MHz. The hyperfine splittings were analyzed to yield values of -0.382(19)% for the hyperfine anomaly and 10.9 GHz/fm2 for the field-shift constant; these agree with published values. The optical isotope shifts obtained, along with published electronic and muonic x-ray shifts, were analyzed to yield r2 values and a specific mass shift in the range 200-300 MHz. This latter is considerably greater than is normally used for 6s2-6s6p transitions. The model dependence of the isotopic-shift analysis was examined, and the hyperfine anomaly was compared with calculations based on Nilsson wave functions. © 1979 The American Physical Society.