Experimental Station 13-3

Beam line 13-3 utilizes a spherical grating monochromator (SGM) on an elliptical polarized undulator (EPU) operating in the photon energy range from 230 eV to 1700 eV with full polarization control (linear vertical/horizontal and circular left/right) covering the C, O, F K-edges, 3d transition metal L-edges, and 4f rare-earth element M-edges.

The primary experimental station at BL13-3 is optimized for Resonant Soft X-ray Scattering (RSXS). In addition, X-ray Absorption Spectroscopy (XAS) and X-ray Magnetic Circular Dichroism (XMCD) via a permanent magnet with a limited field strength (<0.5 Tesla) can be performed using either fluorescence yield (FY) or total electron yield (TEY).

Recently, we integrated a state-of-the-art detect, so called superconducting transition-edge-sensor (TES) into the RSXS setup. It allows us to perform the resonant inelastic x-ray scattering (RIXS)/x-ray emission spectroscopy (XES) under the moderate energy resolution, 1.5 eV (FWHM) at 500 eV.

The RSXS end-station operates at UHV (<10-9 Torr) and is equipped with a limited-angle 4-circle goniometer and a 3-axis sample positioner with temperature control from 24 K to ~320 K. Also, there are a few detectors include Schottky barrier photodiodes with the fixed pin-hole slits, a high quantum efficiency Channeltron, and a 2D-CCD detector that can be translated vertically and covers a wide area. The angular range of the detector can cover angles up to ~176° depending on the detector.

Supported Techniques
Resonant soft x-ray scattering (RSXS)
X-ray Absorption Spectroscopy
X-ray Magnetic Circular Dichroism (XMCD): Limited condition
Soft x-ray emission spectroscopy
Resonant Inelastic x-ray scattering (RIXS) with the limited energy resolution
Main Scientific Disciplines
Condensed Matter Physics
Energy Science
Materials Sciences
Beam Line Specifications


26-pole elliptical polarizing undulator (EPU), 0.25 mrad acceptance

  Energy Range Resolution ΔE/E Spot Size Flux (ph/sec)
focused 230 - 1700 eV ~1 x 10-4 0.02 x 0.5 mm2 1 x 1012



  • Horizontal flat followed by a vertical sphere, both Pt coated
  • Monochromator: Spherical Grating Monochrometer (SGM)
    • 300 l/mm, Ni coated
    • 600 l/mm, Ni coated
    • 1100 l/mm, Pt coated
  • M3: Horizontal focusing mirror
  • 13-3 M2 mirror: Vertical refocusing mirror



  • UHV compatible chamber
  • In-vacuum diffractometer: 4-circle goniometer (limited chi/phi angles)
  • Liq-He cryostat
  • Detectors
    • Point detector: Hamamatsu GaAsP photodiode
    • 2D detector: Greateyes in-vacuum CCD
    • Energy resolved detector: Transition-edge sensor (TES)
      • spectral coverage broader than 1 keV
      • moderate energy resolution of 1.5 eV (FWHM) at 500 eV
Sample Environment
  • Sample temperature: 24 K - 320K
  • Sample size: typically, we prefer ≤ 5 x 5 mm2
  • Magnetic field (~0.4 Tesla) through a permanent magnet (require a field cooling)
  • Load-lock system (maximumly, 4 samples can be loaded)
Data Acquisition and Analysis
  • SPEC
  • Python
  • Matlab
Beam Line Phone
650-926-5133. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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