BL11-2

Overview
BL 11-2

High Resolution Hard X-ray Spectroscopy, 26-pole, 2.0-Tesla Wiggler, ≤ 1.5 mrad Variable Acceptance

Beam line 11-2 is a high-flux XAS station dedicated to molecular biogeochemical and interface sciences. It is optimized for challenging XAS measurements on dilute or radioactive samples and interfaces. To support these experiments, BL11-2 is equipped with collimating and focusing optics, a "double double" Si(220) LN2-cooled monochromator, and a 100-pixel monolithic solid state Ge detector array. Additional instrumentation includes LHe and LN2 cryostats, a grazing incidence XAS spectrometer, and HEPA-filtered controlled exhaust systems that are continuously monitored to detect the presence of air-born radioactivity. It has an adjacent sample preparation room for handling and temporary storage of radioactive samples. BL11-2 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.

Sample Environment —

Minimum Sample Requirement 500 μM, 100 μl solutions; 20 ppm, 10 mg solids
Sample size 3 x 20 x 1 mm (standard powder cell), flat wafers up to 2.5 cm diam
Sample temperature 10-200 K (cryostats)
Ambient pressure experiments

Instrumentation —

Detectors Ionization chambers, Lytle-type fluorescence-yield ion chamber detector, Canberra 100-pixel Ge solid-state monolith, Vortex SiLi solid state detector for special detection geometry requirements.
Cryostat Oxford LHe, LN2 cryostat for magazine capability and radioactive samples
Other Soller slits and scatter-guards, Goniometers for grazing-incidence XAS

Technical Specifications

Energy —

Energy Range Resolution ΔE/E Spot Size Flux
Focused 5000-20000 eV 1 x 10-4 0.5 x 1 mm2 2 x 1012
Unfocused 5000-37000 eV 1 x 10-4 3 x 30 mm2 2 x 1012
Collimated 5000-23000 eV 1 x 10-4 2 x 30 mm2 2 x 1012

Optics —

M0 Mirror M1 Mirror Monochromator
Vertically collimating, flat, bent, 1 m, Si, Rh-coated Bent cylindrical, 1 m, Si, Rh-coated, ~1:1 focusing
In-hutch harmonic rejection capability using a 370 mm Rh coated flat mirror		 LN2 cooled, Si(220), ϕ = 0o & 90o. double-crystal, variable-exit geometry
Monochromator Crystal Glitch Library

Publications

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Science Highlights

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