Abstract
Using a new bunched-beam technique in the GSI heavy-ion experimental storage ring (ESR), we performed precision laser spectroscopy on relativistic heavy ions in the hitherto inaccessible infrared optical region. We determined the wavelength of the transition between the and hyperfine states of the ground state of hydrogenlike . Comparing the result of 1019.7(2) nm with very recent theoretical predictions concerning QED and nuclear size contributions, a disagreement of 4.5 nm is found. Since the nucleus of is well described by the single-particle shell model, uncertainties in nuclear corrections are expected to be small.
- Received 29 September 1997
DOI:https://doi.org/10.1103/PhysRevLett.81.4824
©1998 American Physical Society