BL4-1

Overview
SPEAR3

20-pole, 2.0-Tesla Wiggler, 0.75 mrad, Side Station

Beam line 4-1 is a high-flux station optimized for x-ray absorption spectroscopy and EXAFS experiments requiring x-rays with energies between ~ 6 and 38 keV.  This energy range includes most of the transition metals (all rows), lanthanides and actinides, P-block elements, alkaline and alkaline earths. While it is possible to access x-rays as low as 5 keV, these experiments are challenging because of air absorption and are better performed at BL4-3. BL4-1 can accommodate samples containing uranium and other radionuclides, depending upon their radiotoxicity level, activity, shielding requirements, and complexity of the experimental requirements.  See additional information below under Sample Environment. The beam line offers low temperature measurements (LN2 and LHe) and a 30-element Ge detector system.

Sample Environment —

Sample Temperature 10-200 K (cryostats)
Sample size 3 x 20 x 1 mm (standard powder cell), flat wafers up to 2.5 cm diam
Ambient pressure experiments
Minimum Sample Requirement 1 mM, 100 μl solutions; 100 ppm, 10mg solids
Other See Safety page about Radioactive Samples

Instrumentation —

Detectors Ionization chambers, Lytle-type fluorescence-yield ion chamber detector, Canberra 30-element Ge solid-state, Vortex SiLi solid state detector for special detection geometry requirements.
Cryostat Oxford Liq-He, LN cryostat for magazine capability and radioactive samples
Other Soller slits and scatter-guards

Technical Specifications

Energy —

Energy Range Resolution ΔE/E Spot Size Flux
Unfocused 5500-38000 eV 1 x 10-4 4 x 18mm 2 x 1012
Collimated 5000-23000 eV 1 x 10-4 2 x 18mm 2 x 1012

Optics —

M0 Monochromator
Vertically collimating, flat, bent,1 m, Si, Rh-coated Liquid N2 cooled, Si(220), ϕ = 0o & 90o, double-crystal, variable-exit geometry

Absorption —

N/A

Publications

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Science Highlights

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