Overview
20-pole, 2-Tesla wiggler, 0.5 mrad acceptance
Beam line 7-3 is a wiggler side-station dedicated for x-ray absorption spectroscopy and EXAFS measurements on dilute biological systems. BL7-3 is equipped with a 30-element Ge solid-state detector in addition to ionization chambers and Lytle/PIPS detectors. A dedicated LHe cryostat allows for routine low temperature measurements. The unfocused beam on BL7-3 is ideal for samples especially susceptible to radiation damage, such as high-valent intermediates and other oxidized species.
Sample Environment —
| Minimum Sample Requirement | 500 μM, 100 μl solutions; 10 ppm, 10 mg so |
|---|---|
| Sample size | 5 x 20 mm max |
| Sample temperature | 10-100 K (default configuration, He cryostat with closed-cycle cooled He gas loop) or 4-200 K (He cryostat with open-cycle liquid He dewar) or room temperature (no cryostat). Please indicate sample temperature choice on Beam Time Request (BTR) form to avoid setup delays. |
| Other | Ambient pressure experiments |
Instrumentation —
| Detectors | Ionization chambers, PIPS, Lytle, Canberra 30-element Ge solid-state |
|---|---|
| Cryostat | Oxford Helium cryostat, cooled either by closed-cycle cooled He gas loop (10-100 K) or by open-cycle liquid He dewar (4-200 K). |
| Other | Shutter and variable filters to alleviate beam damage. Soller slits and scatter-guard, multiple-sample changer for room temperature samples. Multiple-sample holder for room temperature samples. Automatic scan queueing available for multiple room temperature samples and/or multiple spots on cold samples. |
Specifications
Technical Specifications
Energy —
| Energy Range | Resolution ΔE/E | Spot Size | Flux | |
|---|---|---|---|---|
| Focused | 5400-32000 eV | 1 x 10-4 | 2 x 15 mm W: 0.1-0.25 m | < 1 x 1012 |
Optics —
| M0 Mirror | Monochromator |
|---|---|
| Flat, bent, vertically collimating, 1 m, Si, Rh-coated | LN2-cooled, Si(220), ϕ = 0o & 90o, double-crystal, non-fixed exit slit Monochromator Crystal Glitch Library |
Absorption —
| 762 microns Be, 205 microns C |
|---|
Publications
Publications
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Highlights
Science Highlights
Beam Line 7-3 Science Highlights
Visualizing the Mechanism of an Ancient Pathway in the Carbon Cycle
Multiphase, Multiscale Chemomechanics at Extreme Low Temperatures: Battery Electrodes for Operation in a Wide Temperature Range
Deciphering the Mechanism of Enzymatic Methane Synthesis
Modern Methods Applied to a Past Poisoning at Minamata Japan
Shared-Ligand Intermediates of Metal Exchange Visualized by Rapid Freeze Quench and Selenium EXAFS of Se-Labeled Metallochaperones. A Paradigm for Studying Copper-Mediated Host-Pathogen Interactions
Significantly Shorter Fe–S Bond in Cytochrome P450-I is Consistent with Greater Reactivity Relative to Chloroperoxidase
New Method Tracks Metal-ion Movement in Periplasmic Proteins
Biomimetic Model Studies Reveal the Role of the Ca2+ Ion in Photosystem II
Iron(IV)hydroxide pKa and the Role of Thiolate Ligation in C-H Bond Activation by Cytochrome P450
Quantification of the Mercury Adsorption Mechanism on Brominated Activated Carbon
Imaging and Speciation of CeO2 and ZnO Nanoparticles in Soybean (Glycine max): Nanoparticle Transfer to the Food Chain
The First Cadmium Enzyme - Carbonic Anhydrase 2 from the Marine Diatom Thalassiosira weissflogii
Understanding the Role of Thiolate Ligation in Nature's Hydroxylating Heme Enzymes
Converting Methane to Methanol: Structural Insight into the Reaction Center of Particulate Methane Monooxygenase
The Structure of a Reaction Intermediate in Enzymatic Halogenation
Ions in the Clutches of Carbon Nanotubes
The New Face of Protein-bound Copper: The Type Zero Copper Site
The Source of Airborne Lead: Recycling Pb-Contaminated Soils
Electronic Structure of O2-Bound Metal Sites in Biomimetic Model Complexes
Plants with the Midas Touch: Formation of Gold Nanoparticles by Alfalfa Plants
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