OVERVIEW

BACK

The SXS beamline is an experimental station dedicated to X-ray Absorption and Photoelectron Spectroscopy in the soft X-rays (1 to 5 keV) energy range. It focuses on to study the electronic, magnetic and geometric structures of materials with applications to atomic and molecular physics, analytical chemistry, environmental and geoscience. Other experimental techniques available include X-ray Magnetic Dichroism and Resonant Auger Spectroscopy.

The SXS beamline is operational for users since 1997 and a broad scientific community including material science, surface science, atomic physics and chemistry among others has used it. Due an increasing demand from the users, in 2009 this beamline had a new X-ray optics in order to provide photons in the energy range from 1000 eV up to 5000 eV.

SXS’ source is a 1.67T bending magnet. There is a nickel-coated and toroidal (1010 x 100 x 100 mm) water cooled mirror that focuses the photon beam at the sample position and it suppresses the harmonic contamination (> 6keV). The incident angle is 0.6 deg and the spot size is 0.6 x 1.2 mm (FWHM) at the sample position.

The monochromator is a double-crystal with 4 pairs of crystals: Si(111), InSb(111), YB66(400) and Beryl(1010). It works under high vacuum ($5 \times 10^{-8}$ mbar) and the first crystals are maintained below 30 Celsius by a water cooling system.

CONTACT

Beamline Email: N/A
Beamline Telephone: +55 19 3512 1138

Coordinator: Flávio César Vicentin
Coordinator Email: flavio.vicentin@lnls.br
Coordinator Telephone: +55 19 3512 1036

OPTICAL ELEMENTS

ElementTypePosition[m]Description
SOURCEBending Magnet0.00Bending Magnet D04 exit A (4°), 1.67 T
MirrorToroidal Horizontal and Vertical Focusing Mirror7.00Ni coated, RT = 668m, RS = 73mm, $\theta$=10 mrad
MonoDouble Crystal Monochromator11.75Water-cooled InSb(111), Si(111), YB$_{66}$ (400) and Beryl(10-10)

PARAMETERS

ParameterValueObs. | Condition
Energy range [keV]1-5Si(111)
Energy resolution [$\Delta$E/E]$10^{-4}$Si(111)
Beam size at sample [$\rm mm^{2}$, FWHM]0.6 x 1.2at 3 keV
Beam divergence at sample [$\rm mrad^{2}$, FWHM]0.2 x 4at 3 keV
Flux density at sample [ph/s/$\rm mm^{2}$]$4\times10^{11}$at 3 keV

INSTRUMENTATION

InstrumentTypeModelSpecificationsManufacturer
Total electron yield detectorElectrometer651420 pA – 2 mA rangeKeithley
Fluorescence DetectorSilicon drift diodeSuperFast SDDArea: 25 $\rm mm^2$; Energy resolution: 125–155 eVAmptek
Photoelectron analyzerHemisphericalPhoibos 150MCD with 9 channels; 3500 eV kinetic energySpecs
FurnaceHalogen lamps/ high vacuum-Max Temp.: 900°CLNLS in-house development
SputteringArgonIG2 ion source0.5-2kV; 2.5mm beam diameter at 25mmRBD
Residual gas analyzerMass spectrometerRGA2001-200 amu; quadrupoleSRS
Sample charge neutralizerElectron flood gunFG15/400-500 eV; 0-5 mASpecs
Sample Cells Liquid-Ultralene window; 4 x 113 $\mu \rm L$LNLS in-house development

CONTROL AND DATA ACQUISITION

All beamline controls are done through EPICS (Experimental Physics and Industrial Control System), running on a PXI from National Instruments. The data acquisition is done using a Red Hat workstation with the Py4Syn, developed at LNLS by SOL group. CSS (Control System Studio) is used as a graphical interface to display and control the beamline devices.

APPLYING FOR BEAMTIME

Submission calls are usually announced twice per year, one for each semester. All the academic research proposals must be submitted electronically through the SAU Online portal. Learn more about how to submit a proposal here.