Abstract
We have conducted two-photon spectroscopy of core excitons in . Synchrotron radiation and laser light were used for core-electron excitation and Auger-free luminescence was detected as the signal. Two-photon excitation enables access to and orbitals that cannot be reached by one-photon excitation of electrons in orbitals. It has been found that the spin-orbit splittings of and states of the Ba ion in are and , respectively.
- Received 4 September 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.076401
©2005 American Physical Society