Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 41: Application of Nuclear Techniques II
HK 41.5: Talk
Tuesday, March 17, 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) )