Electron Spectrometer & Detector
Target specifications for electron analyzer DA-30:
- Energy resolution: < 1.8 meV FWHM at 2 eV pass energy and 20 eV kinetic energy
- Pass energies: 2, 5, 10, 20, 50, 100, and 200 eV
- Transmission mode lens acceptance: +/- 19 degrees
- Angular modes: ± 3.5°, ± 7°, ± 15°*
- Deflection mode Line scan range as Theta angles. 3 modes: x ± 15°, y ± 12°; x ± 7°, y ± 7°; x ± 3.5°, y ± 3.5°
- Deflection mode Spin scan range as Theta angles. 3 modes: x ± 15°, y ± 15°; x ± 7°, y ± 7°; x ± 3.5°, y ± 3.5°
- Angular resolution: < 0.1 degree from 0.1 mm spot
- Transmission mode energy range: 0.5 eV - 1 500 eV
- Angular mode energy range: 3 eV - 1 500 eV
- Deflection mode energy range: 3 eV - 200 eV
- Working distance: 34 mm
- 40 mm diameter MCP detector system
- Bakeable to max 150 degrees C
Specifications of the FERRUM detectors:
- Spin detection based on exchange scattering at an oxidised iron film at 6.3eV scattering energy.
- Sherman function : S > 22% (achieved: 0.29 )
- Reflectivity (I/I0): R > 7,5 % (achieved 10.6 %)
- Fe-film is prepared and oxidised on a W(100) substrate in situ.
- Easy handling of W-substrate preparation, Fe-film evaporation and oxygen dosing.
- Lifetime of oxidized iron-film: several weeks.
- Two channeltrons, for spin-resolved and for integral intensity counting are used.
- Integral intensity is measured with the electron beam deflected electrostatically.
- Two pairs of coils are used to switch the detector magnetization in ± x and ± y to access two orthogonal spin components.
- No mechanical manipulation to switch between the two channeltrons or the four different magnetization directions of the detector.
- Double mu-metal shielded for optimum operation at very low scattering energies.
Alan Chan, Principal Subcontracts Administrator, Phone 5104866768, Email alanchan@lbl.gov
