Heidelberg 2015 – scientific programme
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A: Fachverband Atomphysik
A 26: Poster: Collisions, scattering and recombination
A 26.7: Poster
Wednesday, March 25, 2015, 17:00–19:00, C/Foyer
Coincidence studies of K-LL dielectronic resonances and simultaneous vacuum ultraviolet transitions in highly charged iron — •Stepan Dobrodey1, Sven Bernitt2, Michael Blessenohl1, and José Ramón Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2IOQ, Friedrich-Schiller-Universität, Jena, Germany
We study dielectronic recombination (DR) in iron ions using an electron beam ion trap by observing the Kα X-ray photons and simultaneous transitions in the VUV range. The VUV spectra are obtained using a grating spectrometer equipped with a microchannel plate and a delay line anode. This allows for a time-resolved and wavelength-resolved detection of the VUV photons. The decay of the intermediate excited state to the ground state can occur by cascaded emission of a X-ray and a VUV photon. By recording the intensity of the spectral lines as a funtion of the electron beam energy, it becomes possible to distinguish different relaxation channels and to observe changes in the population of excited intermediate states. By simultaneously detecting a X-ray photon and a VUV photon we could separate decay channels resulting from different DR resonances which could not be resolved in previous measurements. This experimental setup will allow to study photonic relaxation after resonant recombination in more detail.