Abstract
We describe our high-resolution measurements of the state hyperfine structure. An optically narrowed diode laser excites perpendicularly a highly collimated atomic beam. The spectra are calibrated with a stable reference diode laser using a rf locking scheme allowing us to determine the splittings with an accuracy of , an order of magnitude better than previous results. The magnetic dipole , electric quadrupole , and magnetic octupole hyperfine coupling constants are determined. The values we obtained are , , and . This work represents the first observation of the magnetic octupole moment of the cesium nucleus. We carry out atomic-structure calculations and determine the nuclear electric quadrupole moment and nuclear magnetic octupole moment .
- Received 4 March 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.072501
©2003 American Physical Society