Experimental Station 14-3a

Beam line 14-3a, located on the upstream table of the hutch of the BL14-3 bending magnet side station, is dedicated to bulk x-ray absorption spectroscopy of biological, materials, and geological samples in the tender x-ray photon energy range 2.1-5.0 keV. BL14-3 is the only beam line at SSRL capable of obtaining spectroscopy data at the phosphorous K edge. In this configuration the beam is unfocused over a size of 1 mm x 6 mm to allow for high energy-resolution measurements on homogenous samples.  BL14-3 is equipped with ionization chambers, as well as a Vortex silicon drift detector and PIPS detector for fluorescence XAS. Samples are placed inside a helium environment. A motorized sample holder stage allows sequential automated (via queueing) measurement on multiple samples without sample changeover delays.

Status
Open
Supported Techniques
X-ray Absorption Spectroscopy
Tender x-ray absorption spectroscpy
Main Scientific Disciplines
Bioscience
Catalysis
Environmental Sciences
Materials Sciences
Beam Line Specifications

Source

Bending Magnet

  Energy Range Resolution ΔE/E Spot Size Flux
focused 2100-5000 eV ~1 x 10-4 1 x 3 mm  2 x 1010 ph/sec

 

Optics

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

Monochromator: Water-cooled Si(111) ɸ=0, Si(111) ɸ=90 double crystal

Monochromator Crystal Glitch Library

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

M1 mirror: Bent, toroidal, 1.2 m, Ni-coated 

Absorption

none

Instrumentation

Detectors: ionization chambers, Vortex detector, 4-element Vortex detector, large-area PIPS

Sample Positioning: 4-slot and 8-slot motorized sample holder for bulk spectroscopy. A

utomatic scan queueing available for multiple samples and/or spots

 

Sample Environment

Helium environment

Ambient temperature and pressure. Cryo Industries, Cryocool-LHe, LHe cryostream available for cooling (20 - 200 K)

Sample size: flexible, typically 5 x 15 mm solids and 2 mM or higher solutions.

Data Acquisition and Analysis

XASscan, EXAFSPAK, SixPAK

Beam Line Phone
650-926-5143. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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