Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Poster: Precision spectroscopy of atoms and ions (with Q)
A 20.18: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
High prectision x-ray measurements with a metallic magnetic microcalorimeter at the MPIK Hyper-EBIT — •Sebastian Georgi1, Sönke Schäfer2, Thomas M. Baumann1, Andreas Fleischmann2, Joachim Ullrich1, Christian Enss2, and José R. Crespo López-Urrutia1 — 1Max Planck Institute for Nuclear Physics, Heidelberg, Germany — 2Kirchhoff-Institute for Physics, Heidelberg, Germany
A metallic magnetic microcalorimeter for photons in the spectral region between 100 eV and 15 keV was commissioned at the Heidelberg Electron Beam Ion Trap facility. It is cooled to 30mK and consists of eight absorber pixels (250 µm x 250 µm sensitive area each) made of 5 µm thick gold (5N). Each absorber is thermally linked to a paramagnetic sensor made of erbium doped gold, so that the temperature increase due to the absorption of a photon result in a magnetization change of the sensor which can be precisely measured by a SQUID magnetometer. We investigated the dielectronic recombination resonances of He-like and Li-like iron ions, and also directly exited M-shell transitions of tungsten ions. The recorded iron spectra were compared with results from theoretical multi-configuration Dirac-Fock calculations. The measured energies of seven 4f → 3d and five 5f → 3d transitions of Ni- to Ti-like tungsten ions were compared to calculations carried out with the Flexible Atomic Code [1] and with results 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