Experimental Station 7-3

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.

Supported Techniques
X-ray Absorption Spectroscopy
Main Scientific Disciplines
Biomedical Sciences
Structural Molecular Biology
Beam Line Specifications


20-pole, 2-Tesla wiggler, 0.8 mrad beam, Side station

  Energy Range Resolution ΔE/E Spot Size Flux
Unfocused 5400-32000 eV 1 x 10-4 2 x 15 mm2 ~1 x 1012



M0 mirror: Flat, bent, vertically collimating, 1 m, Si, Rh-coated

Monochromator: LN2 cooled, Si(220), ϕ = 0o & 90o. double-crystal, non-fixed exit slit

Monochromator Crystal Glitch Library 

Crystal changes need to be scheduled and coordinated in advance with BL support staff


762 microns Be, 205 microns C


Detectors: Ionization chambers, PIPS, Lytle, Canberra 30-element Ge solid-state

Cryostat: Oxford LHe cryostat (4-200 K)

Other: Shutter and variable filters to alleviate beam damage. Soller slits and scatter-guard

Sample Environment

Ambient pressure experiments

Sample temperature: 10-200 K (LHe cryostat) or Room temperature (no cryostat)

Sample size: 5 X 20 mm

Minimum Sample Requirement: 500 μM, 100 μl solutions; 10 ppm, 10mg solids

Data Acquisition and Analysis


X-ray Data Booklet

Beam Line Phone
650-926-5273. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact
Beam Line Engineering Notes

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