Highly Charged Ion Research at the Livermore Electron Beam Ion Traps

Details Highly Charged Ion Research at the Livermore Electron Beam Ion Traps Highly Charged Ion Research at the Livermore Electron Beam Ion Traps

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phst..120...40b&link_type=abstract

Physica Scripta, Volume T120, pp. 40-46 (2005).

Physics

Atomic Physics

1

Scientific paper

Spectroscopy performed with the three Livermore electron beam ion traps is reviewed, which is continuing and complementing the innumerable contributions to atomic physics provided over the years by heavy-ion accelerators. Numerous spectrometers were developed that cover the spectral bands from the visible to the hard x-ray region. These enabled exhaustive line surveys useful for x-ray astrophysics and for systematic studies along iso-electronic sequences, such as the 4s 4p, 3s 3p, and 2s 2p transitions in ions of the Cu-I, Na-I, and Li-I sequences useful for studying QED and correlation effects as well as for precise determinations of atomic-nuclear interactions. They also enabled measurements of radiative transition probabilities of very long-lived (milli- and microseconds) and very short-live (femtosecond) levels. Because line excitation processes can be controlled by choice of the electron beam energy, the observed line intensities are used to infer cross sections for electron-impact excitation, dielectronic recombination, resonance excitation, and innershell ionization. These capabilities have recently been expanded to simulate x-ray emission from comets by charge exchange. Specific contributions to basic atomic physics, nuclear physics, and high-temperature diagnostics are illustrated.

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