BL7-3

    Overview

    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.

    Status

    Beamline Parameters

    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

    Source

    Wiggler

    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.

    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

    Absorption

    762 microns Be, 205 microns C


    BL7-3

    Publications

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    Science Highlights

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