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 DA30 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.

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

Source

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

Optics

  • 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
     

Absorption

Instrumentation
  • Detector: SCIENTA DA30 Electron Analyzer
  • SCIENTA 3D mini-Mott spin detector (planned)
  • 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
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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