title: Radiative lifetime of a bound excited state of Te-.
abstract: We report on the first experimental study of the lifetime of a bound excited state of a negative ion. A new experimental technique was developed and used to measure the radiative lifetime of the 5p(5) (2)P(1/2) level of Te-. The experiment was performed in a magnetic storage ring, where a laser beam was applied along one of the straight sections. In the experiment the population of the excited J=1/2 level was probed each time the Te- ions passed through the laser field. A decay curve was built up by sampling the population of the excited level of the Te- ions as a function of time after injection into the ring. A multiconfiguration Dirac-Hartree-Fock calculation was performed in conjunction with the experiment. The calculation yielded a radiative lifetime of 0.45 s, in excellent agreement with the measured value of 0.42(5) s.
authors.affiliation: Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Ellmann
authors.forename: P
authors.initials: P
authors.lastname: Schef
authors.forename: P
authors.initials: P
authors.lastname: Lundin
authors.forename: P
authors.initials: P
authors.lastname: Royen
authors.forename: S
authors.initials: S
authors.lastname: Mannervik
authors.forename: K
authors.initials: K
authors.lastname: Fritioff
authors.forename: P
authors.initials: P
authors.lastname: Andersson
authors.forename: D
authors.initials: D
authors.lastname: Hanstorp
authors.forename: C
authors.initials: C
authors.lastname: Froese Fischer
authors.forename: F
authors.initials: F
authors.lastname: Osterdahl
authors.forename: D J
authors.initials: DJ
authors.lastname: Pegg
authors.forename: N D
authors.initials: ND
authors.lastname: Gibson
authors.forename: H
authors.initials: H
authors.lastname: Danared
authors.forename: A
authors.initials: A
authors.lastname: Källberg