We report on the spectroscopic measurement of the 210Fr 9S1/2 energy obtained by two-photon excitation of atoms confined and cooled in a magneto-optic trap. The resonant intermediate level 7P3/2 is the upper state of the trapping transition. We have measured the energy difference between the 9S1/2 state and the 7S1/2 ground state to be 25 671.021 ± 0.006 cm-1.
© 1996 Optical Society of America
J. E. Simsarian, W. Shi, L. A. Orozco, G. D. Sprouse, and W. Z. Zhao, "7S1/2 → 9S1/2 two-photon spectroscopy of trapped francium," Opt. Lett. 21, 1939-1941 (1996)