K. Deilamian et al., ISOTOPE SHIFTS AND HYPERFINE SPLITTINGS OF THE 398.8-NM YB I-LINE, Journal of the Optical Society of America. B, Optical physics, 10(5), 1993, pp. 789-793
We report the first observation to our knowledge of the 6s2 1S0-6s6p 1
P1-degrees transition (398.8 nm) of Yb-168. The relative position of t
his spectral line was directly determined by using a laser sideband te
chnique to simultaneously probe pairs of lines. The hyperfine structur
e of Yb-171 and the isotope shifts of Yb-170, Yb-171, and Yb-174 were
determined to an accuracy of better than 6 MHz and found to differ by
as much as 23 MHz from previous results. By using photon-burst spectro
scopy to carry out these measurements we obtained subnatural linewidth
s and fully resolved the Yb-170 and Yb-171 lines, which otherwise over
lap in fluorescence.