Overview
Beam line 9-3 is a high flux focused wiggler side-station optimized for x-ray absorption spectroscopy (XANES and EXAFS) in the 5.5–30 keV range, dedicated for x-ray absorption spectroscopy and EXAFS measurements on dilute biological systems. A dedicated LHe cryostat allows for routine low temperature measurements. The station features a double-crystal Si(220) monochromator with energy resolution up to 10-4(ΔE/E) and small vertical entrance slits to reduce intensity glitches. Equipment includes a Canberra 100-element Ge detector for dilute samples, a Mirion 24-element Ge detector, a passivated implanted planar silicon (PIPS) semiconductor detector for fluorescence detection, ionization chambers for transmission data, and a LHe cryostat for maintaining samples at ~10 K (4-200 K with LHe dewar).
Source: 20-pole, 2-Tesla wiggler side station, 0.8 mrad acceptance
Status —
Beamline Parameters —
| Energy Range | Resolution ΔE/E | Spot Size | Flux | |
|---|---|---|---|---|
| Focused | 5500-30000 eV | 1 x 10-4 | 1 x 4 mm2 | ~2 x 1012 |
Optics —
| M0 Mirror | M1 Mirror | Monochromator |
|---|---|---|
| Vertically collimating, flat, bent, 1 m, Si, Rh-coated | Cylindrical, bent, 1.2 m, Zerodur, Rh-coated | Si(220), ϕ = 0o & 90o. double-crystal, variable-exit geometry |
Source —
Instrumentation —
| Detectors | Canberra 100-element germanium solid state detector. Mirion 24-element germanium solid state detector with Xspress3X electronics. Passivated implanted planar silicon (PIPS) semiconductor detector. Ionization chambers. |
|---|---|
| Ancillary | Soller slits and scatter guards, sample shutter to alleviate beam damage, automatic scan queueing for multiple samples/multiple spots on samples. Oxford Helium cryostat, cooled by liquid He dewar (4-200 K). Multiple-sample holder for room temperature samples. |
Sample Environment —
| Standard room temp | Ambient pressure Single sample holder 4 slot sample holder 8 slot sample holder |
|---|---|
| Standard LHe cryostat | Sample temperature ~10 K: Single solid sample 4-slot solid sample cassette Ssingle solution sample 5-slot solution sample cassette |
| Non-standard setups | Communicate with beam line staff well in advance to ensure your set-up will work. |
Absorption —
| 768 microns Be, 205 microns C |
|---|
