Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Poster: Precision spectroscopy of atoms and ions (with Q)
A 20.17: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
X-ray measurements of highly charged ions with a microcalorimeter — Sebastian Georgi1, Sönke Schäfer2, Thomas M. Baumann1, Andreas Fleischmann2, Christian Enss2, Joachim Ullrich3, and •José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Ruprecht-Karls-Universität, Heidelberg — 3Physikalisch-Technische Bundesanstalt, Braunschweig
A metallic magnetic microcalorimeter for photons in the spectral region 100-15000 eV was commissioned at the Heidelberg Electron Beam Ion Trap facility. It consists of eight absorber pixels made of erbium-doped gold held at 30 mK. Their temperature change due to the absorption of a single X-ray photon is used to determine its energy: Each absorber is thermally linked to a paramagnetic sensor in which a magnetization change is precisely measured by a superconducting interference device. A nested focusing X-ray mirror system is used for increased detection efficiency. We investigated the dielectronic recombination resonances of He-like and Li-like iron ions, and directly excited M-shell transitions of tungsten ions, achieving a resolution of 9,eV. The iron results were compared with multi-configuration Dirac-Fock calculations; those of the 4f → 3d transitions of Ni-like to Ti-like, and of 5f → 3d transitions of Ni-like to Cr-like tungsten ions, with Flexible Atomic Code [1] calculations of our own and with data from [2,3].
[1] M. F. Gu, Can. J. Phys. 86 (2008) 675
[2] P. Neill et al., Can. J. Phys., 82 (2004) 931
[3] J. Clementson et al., Phys. Scripta 81 (2010) 015301