Experimental Station 13-2

Beam line 13-2 has an APPES (ambient pressure photoemission spectroscopy) station with a differentially pumped electron spectrometer (SES-100, VG-Scienta).  The chamber is designed for photoemission spectroscopy and Auger electron yield x-ray absorption spectroscopy measurements under near ambient condition (up to a few 10’s Torr). The APPES station provides the capability to investigate thermal catalytic and electrochemical processes under reactive conditions. The sample temperature can be varied from 300 K to 600 K under reactive conditions by resistive heating of super alloy wires. A Xe lamp for in-situ irradiation and a quadrupole mass analyzer for on-line gas line analysis are also available. A horizontally mounted manipulator transfers samples between the ambient analysis chamber and an ultra-high vacuum preparation chamber.  Sputtering, vacuum annealing and ultra-high vacuum compatible evaporation are available in the preparation chamber.

Supported Techniques
Photoemission spectroscopy
Soft x-ray absorption spectroscopy
Main Scientific Disciplines
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 270-1450 eV (XPS), 180-1450 eV (XAS) 1 x 10-4 0.01 x 0.075 mm2 1011 - 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
  • Kirkpatrick-Baez Mirror Pair (Pt)



  • Ambient Pressure Photoemission System (APPES)
Sample Environment
  • UHV ~ 10 Torr
  • Sample size: < 5 x 5 mm2
  • Sample temperature: 300 - 600 K
  • Sample requirement: Non-Volatile, Non-Toxic
Data Acquisition and Analysis
  • SPEC
  • Ses.exe
  • Igor Pro
Beam Line Phone
650-926-5132. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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