Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.26: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Absolute Kα line energies in highly charged Fe ions using X-ray fluorescence spectroscopy — •Jan K. Rudolph1,2, Sven Bernitt2, René Steinbrügge2, Alfred Müller1, and José R. Crespo López-Urrutia2 — 1Institut für Atom- und Molekülphysik, Gießen, Germany — 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany
Active galactic nuclei X-ray spectra show prominent features originating from iron Kα transitions.
Line emissions of iron ions up to the heliumlike charge state from 6.4 keV to 6.7 keV photon energy provide rich information on the dynamics of X-ray binary stars.
To study these transitions we used the Heidelberg transportable electron beam ion trap called FLASH-EBIT [1] to produce a dense target of highly charged iron ions.
Kα transitions in this ion cloud were resonantly excited by a monochromatic X-ray beam at the PETRA III synchrotron photon source.
Afterwards the fluorescence signal was detected and used to measure line profiles.
We report on absolute line energies with an accuracy of a few ppm for several electric dipole allowed Kα transitions in Fe(17−24)+ ions [2].
Also the natural line widths of the investigated fluorescence lines were determined.
Well known absorption K-edges were taken as a reference for energy calibration.
This method of measuring absolute line energies combining an EBIT with a high resolved and focused X-ray beam at a synchrotron overcomes classical methods like crystal spectrometer measurements.