Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Poster II
A 23.7: Poster
Donnerstag, 11. März 2010, 16:30–19:00, Lichthof
Photoionization of Fe14+: Experimental Absolute Cross-Sections — M. C. Simon1, •C. Beilmann1, M. Schwarz1, S. W. Epp1, B. L. Schmitt1, Z. Harman1,2, T. M. Baumann1, E. Behar3, R. Follath4, O. Schwarzkopf4, S. Bernitt1, R. Ginzel1, S. G. Higgins1, R. Klawitter1, K. Kubiček1, V. Mäckel1, C. H. Keitel1, P. H. Mokler1, G. Reichardt3, J. Ullrich1, and J. R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2ExtreMe Matter Institute EMMI, Planckstrasse 1, 64291 Darmstadt, Germany — 3Technion Israel Institute of Technology, Physics Department, Haifa 32000, Israel — 4Helmholtz-Zentrum Berlin, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
X-ray astrophysics received increasing attention in the last decade, due to the launches of the X-ray observatories Chandra and XMM-Newton. Photoionization (PI) of highly charged ions (HCIs) plays an important role for the interpretation of the spectra obtained. However, established methods for PI investigations either lack of accuracy or are only applicable to ions in low charge state. We present a novel approch, where the ion cloud of an electron beam ion trap (EBIT) with typical target-ion area densities of 1010 ions/cm2 is exposed to Synchrotron radiation. PI of Fe14+ in the photon energy range from 450 to 1100 eV was investigated at BESSY II. A resolving power of up to 6500 and a calibartion limited accuracy of 150 meV were achieved and the feasibility of an absolute cross-section measurement was demonstrated.