Abstract
High-resolution measurements of the hyperfine structures and isotope shifts are reported for Kr i n=5,6,7 4ns Rydberg levels, obtained using an extreme-ultraviolet laser with a bandwidth of 210 MHz in a resonant two-photon-ionization scheme. Use of known frequencies yields an improved absolute calibration of the Kr energy levels by more than one order of magnitude. The nuclear quadrupole hyperfine structure indicates that the 46s and 47s states are described by a pure jj-coupling scheme, whereas the 45s states depart from a pure jj-coupling scheme by 0.37(6)%. The magnetic hyperfine structure shows that the 4ns states are mixed with 4n’d states. The isotope shifts can be described as pure mass effects within the precision of our experiment. For the 46s and 47s states, lifetimes were determined that differ markedly from theoretical literature values.
- Received 8 August 1988
DOI:https://doi.org/10.1103/PhysRevA.39.2948
©1989 American Physical Society