title: 7S(1/2) ? 9S(1/2) two-photon spectroscopy of trapped francium.
abstract: We report on the spectroscopic measurement of the (210)Fr 9S(1/2) energy obtained by two-photon excitation of atoms confined and cooled in a magneto-optic trap. The resonant intermediate level 7P(3/2) is the upper state of the trapping transition. We have measured the energy difference between the 9S(1/2) state and the 7S(1/2) ground state to be 25 671.021 +/- 0.006 cm(-1).
authors.forename: J E
authors.initials: JE
authors.lastname: Simsarian
authors.forename: W
authors.initials: W
authors.lastname: Shi
authors.forename: L A
authors.initials: LA
authors.lastname: Orozco
authors.forename: G D
authors.initials: GD
authors.lastname: Sprouse
authors.forename: W Z
authors.initials: WZ
authors.lastname: Zhao