BL11-2

Overview

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.

Status —

Beamline Parameters —

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

Source —

Wiggler

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

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
Data Acquisition and Analysis


BL 11-2

Publications

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Science Highlights

Beam Line 11-2 Science Highlights

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