Abstract
We study the transition of by high-precision laser spectroscopy using two-photon Doppler-free excitation and photoionization detection. Interferometric cross referencing to metrologic Rb two-photon transitions allowed measurement of the transition isotope shift and hyperfine splitting in the state with precision at the 30 kHz level. The results are , , and . Combined with recent theoretical work, the isotope shift yields a new value for the change in squared nuclear charge radii . This is compared with other work and some existing discrepancies are resolved.
- Received 13 March 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.043004
©2003 American Physical Society