Beam line 7-3 is a high flux wiggler side-station optimized for x-ray absorption spectroscopy (XANES and EXAFS) in the 5.5–40 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 unfocused beam on BL7-3 is ideal for samples especially susceptible to radiation damage, such as high-valent intermediates and other oxidized species.
The station features a double-crystal Si(220) monochromator with energy resolution up to 10-5 (ΔE/E)and small vertical entrance slits to reduce intensity glitches. Equipment includes a Canberra 30-element Ge detector for dilute samples, a passivated implanted planar silicon (PIPS) semiconductor detector for fluorescence detection, ionization chambers for transmission data, and LHe cryostats for maintaining samples at ~10 K (10-100 K default configuration, 4-200 K with LHe dewar.
Source: 20-pole, 2-Tesla wiggler side station, 0.8 mrad acceptance
