title: Improved measurement of the 1s2s 1S0-1s2p 3P1 interval in heliumlike silicon.
abstract: Using colinear fast-beam laser spectroscopy with copropagating and counter-propagating beams we have measured the 1s2s 1S0-1s2p 3P1 intercombination interval in 28Si12+ with the result 7230.585(6) cm{-1}. The experiment made use of a dual-wavelength, high-finesse, power build-up cavity excited by single-frequency lasers at 1319 and 1450 nm. The result will provide a precision test of ab initio relativistic many-body atomic theory at moderate Z.
authors.affiliation: Department of Physics, Florida State University, Tallahassee, Florida 32306-4350, USA.
authors.forename: Thomas R
authors.initials: TR
authors.lastname: DeVore
authors.forename: David N
authors.initials: DN
authors.lastname: Crosby
authors.forename: Edmund G
authors.initials: EG
authors.lastname: Myers