Experimental Station 9-3

Beam line 9-3 is a wiggler side-station dedicated to biological x-ray absorption spectroscopy and EXAFS measurements of dilute solutions and single crystals. BL9-3 is equipped with a 100-element Ge monolithic solid-state detector in addition to ionization chambers and PIPS/Lytle detectors. A dedicated LHe cryostat allows for routine low temperature measurements on solutions. A Huber-Kappa goniometer, a LHe cryostream, a focusing polycapillary and a MAR CCD detector are available (in addition to specialized software) for single crystal measurements. The higher flux, tighter focus and excellent beam stability on BL9-3 is ideal for very dilute samples and single crystals of appropriate dimensions.

Supported Techniques
X-ray Absorption Spectroscopy
Single crystal x-ray absorption spectroscopy
Main Scientific Disciplines
Biomedical Sciences
Structural Molecular Biology
Beam Line Specifications


16-pole, 2-Tesla Wiggler, 2 mrad acceptance

  Energy Range Resolution ΔE/E Spot Size Flux
Focused 5000-30000 eV 1 x 10-4 1 x 4 mm2 ~2 x 1012



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

M1 mirror: cylindrical, bent, 1.2 m, Zerodur, 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


768 microns Be, 205 microns C


Detectors: Ionization chambers, PIPS, Lytle, Canberra 100-element Ge monolith solid-state, MAR IP or CCD for single crystal XAS

In-hutch OpticsPolycapillary focusing optic for 200 μm beam applications.

Cryostat: Oxford LHe cryostat (4-200 K), LHe cryostream for single crystal XAS (>10 K)

Other: Shutter and variable filters to alleviate beam damage, Soller slits and scatter-guard, Huber Kappa Goniometer for single crystal XAS, 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

Ambient pressure experiments

Sample temperature: 10-200 K (solution), 20-50 K (single crystal) or Room Temperature

Sample size: 5 x 20 mm, > 100 μm (all dimensions, for single crystal)

Minimum Sample Requirement: 500 μM, 100 μl solutions; 10 ppm, 10 mg solids; >5 single crystals of appropriate dimensions

Data Acquisition and Analysis

Web-XAS Data Collector, μ-XAS, EXAFSPAK

X-ray Data Booklet

Beam Line Phone
650-926-5293. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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