OVERVIEW OF THE CURRENT SPECTROSCOPY EFFORT ON THE LIVERMORE ELECTRON-BEAM ION TRAPS

An overview is given of the current spectroscopic effort on the Liverm ore electron beam ion trap facilities. The effort focuses on four aspe cts: spectral line position, line intensity, temporal evolution, and l ine shape. Examples of line position measurements include studies of t he K-shell transitions in heliumlike Kr34+ and the 2s-2p intrashell tr ansitions in lithiumlike Th87+ and U89+, which provide benchmark value s for testing the theory of relativistic and quantum electrodynamical contributions in high-Z ions. Examples of line intensity measurements are provided by measurements of the electron-impact excitation and die lectronic recombination cross sections of the heliumlike transition-me tal ions Ti20+ through Co25+. A discussion of radiative lifetime measu rements of metastable levels in heliumlike ions is given to illustrate our time-resolved spectroscopy techniques in the microsecond range. W e also present a measurement of the spectral lineshape that illustrate s the very low ion temperatures that can be achieved in an EBIT.