A systematic calculation of the hyperfine structure of 2 P levels of heliumlike ions is presented. Reduced matrix elements of the magnetic-dipole hyperfine operator between substates of the 2 P states are evaluated using relativistic configuration-interaction wave functions that account for both Coulomb and Breit interactions. These matrix elements, together with the energy intervals DE105E(2 P...

We demonstrate a technique for directly measuring the fine-structure interval in alkali atoms using two frequency-stabilized diode lasers. Each laser has a linewidth of order 1 MHz and precise tunability: one laser is tuned to a hyperfine transition in theD1 line, and the other laser to a hyperfine transition in the D2 line. The outputs of the lasers are fed into a scanning Michelson interferom...

The magnetic hyperfine structure observed in the (57)Fe Mössbauer spectra of the high-potential iron protein from Chromatium shows that the iron atoms are inequivalent in pairs, with hyperfine fields of 121 and 90kG.