Experimental Station 5-2

The BL5-2 station is a plane grating monochromator beam line optimized for high-resolution angle-resolved photoemission spectroscopy (ARPES) in the photon energy range of 25 - 200 eV with full polarization control. The dedicated experimental end station is equipped with a SCIENTA DA30L electron spectrometer. This system is capable of performing ARPES experiments with a total energy resolution of a few meV and an angular resolution of ~0.1°. It is also equipped with a low-temperature sample manipulator with three degree of freedom of rotation, which can be cooled down to <10 K.  Because BL5-2 and BL5-4 cannot operate simultaneously, they are often shown combined as BL5-4/BL5-2. Users may choose either experimental station for their beamtime. Please confirm with the responsible beam line scientists on the readiness of desired experimental station in advance.

Supported Techniques
Angle-resolved photoelectron spectroscopy
Ultra-high energy resolution photoemission
Main Scientific Disciplines
Condensed Matter Physics
Materials Sciences
Beam Line Specifications


15-period undulator, 31-pole APPLE-II EPU, 0.65 mrad acceptance

  Energy Range Resolution ΔE/E Spot Size Flux (ph/sec)*
Focused 25 - 200 eV ≥ 2.5 X 10-5 0.04(H) X 0.01(V) mm2 ~ 2 X 1012

*@500 mA, 50 eV, E/ΔE = 10,000


  • M0: horizontal deflecting, flat, water-cooled
  • M1: horizontal deflecting, flat, water-cooled
  • Monochromator: Variable Line Spacing Plane Grating Monochromator (VLSPGM)
    • 1200 l/mm, c = 1.5 (HOSG)
    • 1200 l/mm, c = 3.0 (HRG)
    • 600  l/mm, c = 4.0 (HRG2) (planned)
  • M3: horizontal and vertical refocusing, elliptical toroidal


  • Detector: SCIENTA DA30L Electron Analyzer
  • Manipulator: Low-temperature 6-axis Manipulator
  • Alkaline metal doser (K, Rb, Li)
Sample Environment
  • UHV: < 5 X 10-11 Torr
  • Sample temperature: <10 - 300 K
  • Sample size: < 10 X 10 mm2
  • Annealing temperature: < 1000 C°
Data Acquisition and Analysis
  • Python (Scienta PEAK and SPEC based)
Beam Line Phone
650-926-5252. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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