DOI: 10.1063/1.2808334. KMC-1: A high resolution and high flux soft x-ray beamline at BESSY

KMC-1: A high resolution and high flux soft x-ray beamline at BESSY

10.1063/1.2808334

Crossref journal-article

AIP Publishing

Review of Scientific Instruments (317)

Abstract

The crystal monochromator beamline KMC-1 at a BESSY II bending magnet covers the energy range from soft (1.7keV) to hard x-rays (12keV) 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 (6mrad) with the toroidal premirror, and (4) the optimization of the crystal optics to the soft x-ray range necessitating quasibackscattering crystal geometry (θBragg,max=82°) 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 1011–1012photons∕s range and beamline resolving powers of more than E∕ΔE≈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 150meV is possible. This article describes the design features of the beamline and reports some experimental results in the above mentioned fields.

Bibliography

Schaefers, F., Mertin, M., & Gorgoi, M. (2007). KMC-1: A high resolution and high flux soft x-ray beamline at BESSY. Review of Scientific Instruments, 78(12).

Authors 3

F. Schaefers (first)
M. Mertin (additional)
M. Gorgoi (additional)

References 47 Referenced 173

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Dates

Type	When
Created	17 years, 8 months ago (Dec. 5, 2007, 2:18 a.m.)
Deposited	2 years, 1 month ago (July 3, 2023, 9:57 p.m.)
Indexed	3 weeks, 1 day ago (July 30, 2025, 6:49 a.m.)
Issued	17 years, 8 months ago (Dec. 1, 2007)
Published	17 years, 8 months ago (Dec. 1, 2007)
Published Online	17 years, 8 months ago (Dec. 4, 2007)
Published Print	17 years, 8 months ago (Dec. 1, 2007)

Funders 0

None

BibTeX

@article{Schaefers_2007, title={KMC-1: A high resolution and high flux soft x-ray beamline at BESSY}, volume={78}, ISSN={1089-7623}, url={http://dx.doi.org/10.1063/1.2808334}, DOI={10.1063/1.2808334}, number={12}, journal={Review of Scientific Instruments}, publisher={AIP Publishing}, author={Schaefers, F. and Mertin, M. and Gorgoi, M.}, year={2007}, month=dec }

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