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A: Fachverband Atomphysik
A 25: Posters: Precision spectroscopy of atoms and ions
A 25.6: Poster
Thursday, March 13, 2008, 16:30–18:30, Poster C3
Absolute determination of x-ray transition energies in hydrogen- and heliumlike ions at the Heidelberg EBIT — •Katharina Kubiček1, Johannes Braun1, Hjalmar Bruhns2, José R. Crespo López-Urrutia1, and Joachim Ullrich1 — 1Max-Planck-Institut for Nuclear Physics, Heidelberg, Germany — 2Columbia Astrophysics Laboratory, New York, USA
Absolute and relative high-precision wavelength measurements on highly charged ions (HCI) using an improved Bond method were carried out at the Heidelberg electron beam ion trap (EBIT). Measuring the Lyman-α1 transition in Ar17+ and “w” (1s2p 1P1→1s2 1S0) resonance line in Ar16+ resulted in transition energies of 3322.993(16) eV and 3139.588(12) eV. These results are the most precise absolute measurements on transition energies in highly charged ions up to now, with total errors of 5 ppm and 4 ppm. The Lyman-α1 in S15+ and "w" transition energy in S14+ yielded 2622.692(27) eV and 2460.629(31) eV . The "w" transition energies were also measured relatively to the Lyman-α1 transitions. A new method for determination of the Bragg angle making use of two light fiducial beams to determine the incoming direction of the x-rays implemented at the flat crystal spectrometer at our laboratory was applied to increase the precision to the present level.