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A: Fachverband Atomphysik
A 15: Poster I
A 15.3: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster
Absolute Determination of X-ray Transition Energies in S14+ and Ar16+Ions — •Katharina Kubicek, Hjalmar Bruhns, Johannes Braun, José R. Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut for Nuclear Physics, Heidelberg, Germany
We report on relative and absolute high-precision wavelength experiments for H-like and He-like ions, performed at the Heidelberg Electron Beam Ion Trap (EBIT) using a flat crystal (Si-111) X-ray spectrometer. Our measurements resulted in λw = 5038.695(74) mÅ, or Ew = 2460.641(32) eV for the 1s2p 1P1→1s2 1S0 resonance line (w transition) in S14+. The error of only 13 ppm is a factor of ∼ 3 smaller than the former most precise value for this transition energy. Our result for the Ar16+ w transition, λw = 3949.066(8) mÅ, or Ew = 3139.583(6) eV, has an even smaller uncertainty of only 2 ppm being 6 times more accurate than the most precise measurement in any He-like ion and to the present day a factor 2.5 better than any X-ray wavelength determinaton in HCIs ever reported. As expected, in both cases excellent agreement with theory is obtained. The Lyman-α1 X-ray transition wavelength was used as calibration line.