KMC-1: A high resolution and high flux soft x-ray beamline at BESSY
- BESSY GmbH, Albert-Einstein-Strasse 15, 12489 Berlin (Germany)
The crystal monochromator beamline KMC-1 at a BESSY II bending magnet covers the energy range from soft (1.7 keV) to hard x-rays (12 keV) employing the (n,-n) double crystal arrangement with constant beam offset. The monochromator is equipped with three sets of crystals, InSb, Si (111), and Si (422) which are exchangeable in situ within a few minutes. Beamline and monochromator have been optimized for high flux and high resolution. This could be achieved by (1) a windowless setup under ultrahigh-vacuum conditions up to the experiment, (2) by the use of only three optical elements to minimize reflection losses, (3) by collecting an unusually large horizontal radiation fan (6 mrad) with the toroidal premirror, and (4) the optimization of the crystal optics to the soft x-ray range necessitating quasibackscattering crystal geometry ({theta}{sub Bragg,max}=82 deg.) delivering crystal limited resolution. The multipurpose beamline is in use for a variety of user facilities such as extended x-ray absorption fine structure, ((Bio-)EXAFS) near-edge x-ray absorption fine structure (NEXAFS), absorption and fluorescence spectroscopy. Due to the windowless UHV setup the k edges of the technologically and biologically important elements such as Si, P, and S are accessible. In addition to these experiments this beamline is now extensively used for photoelectron spectroscopy at high kinetic energies. Photon flux in the 10{sup 11}-10{sup 12} photons/s range and beamline resolving powers of more than E/{delta}E{approx_equal}100.000 have been measured at selected energies employing Si (nnn) high order radiation in quasibackscattering geometry, thus photoelectron spectroscopy with a total instrumental resolution of about 150 meV is possible. This article describes the design features of the beamline and reports some experimental results in the above mentioned fields.
- OSTI ID:
- 21024669
- Journal Information:
- Review of Scientific Instruments, Vol. 78, Issue 12; Other Information: DOI: 10.1063/1.2808334; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ABSORPTION SPECTROSCOPY
BESSY STORAGE RING
CRYSTALS
FINE STRUCTURE
FLUORESCENCE SPECTROSCOPY
HARD X RADIATION
INDIUM ANTIMONIDES
KEV RANGE
KINETIC ENERGY
MAGNETS
MEV RANGE
MONOCHROMATORS
PHOTONS
RESOLUTION
SOFT X RADIATION
X-RAY FLUORESCENCE ANALYSIS
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY