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Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 41: Application of Nuclear Techniques II

HK 41.5: Vortrag

Dienstag, 17. März 1998, 18:15–18:30, G

A grating spectrometer for soft x-ray interferometry experiments at MAMI — •S. Dambach, H. Backe, N. Clawiter, Th. Doerk, N. Eftekhari, H. Euteneuer, F. Hagenbuck, K.H. Kaiser, O. Kettig, G. Kube, W. Lauth, H. Mannweiler, A. Steinhof, and Th. Walcher — Institut für Kernphysik, Universität Mainz, D-55099 Mainz

A grating spectrometer has been constructed and tested at MAMI for a soft x-ray interferometry with a collinear arrangement of two identical undulators. To resolve fine structures in the complex index of refraction of a thin foil placed between the undulators the spectral resolution should be in the order of 103 to 104. The spectrometer is realized in grazing incidence geometry with a grating of variable line density which provides dispersion and focusing of the undulator radiation in an energy range from 200 eV to 2 keV by only one optical element. The instrument has been tested at the 1S→3P neon transition at ℏ ω = 867 eV. The experimental determined resolution of about 2000 is in good agreement with calculations. The spectrometer is well suited for the above mentioned interferometry experiments as has been demonstrated by the measurements at the LIII, LII absorption edge of nickel.
Work supported by DFG (SFB 201) and BMBF ( 06MZ863I9(TP2) )

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