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Publication Citation: Improved Low-Energy Diffuse Scattering Electron-Spin Polarization Analyzer

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Author(s): M Scheinfein; Daniel Thornton Pierce; John NMN Unguris; Jabez J. McClelland; Robert Celotta; Michael H. Kelley;
Title: Improved Low-Energy Diffuse Scattering Electron-Spin Polarization Analyzer
Published: January 01, 1989
Abstract: An improved low-energy diffuse scattering electron-spin polarization analyzer is described. It is based on the low-energy (150 eV) diffuse scattering of polarized electrons from polycrystalline evaporated Au targets. By collecting large solid angles and efficiently energy filtering the scattered electrons, a maximum figure of merit, FOM=S2I/I0=2.3¿10-4 is achieved. Maximum measured values of the Sherman function were S=0.15. Further, the instrumental (false) asymmetry due to changes in the trajectory of the incident electron beam has been minimized by balancing the angular and displacement asymmetries. A total residual scan asymmetry as low as 0.0035/mm has been measured over 4-mm scan fields at the Au target in the detector. This instrumental asymmetry would produce a maximum error in the polarization in a SEMPA experiment of less than 0.3% for a 100-υm full-field scan. Details of the design and performance of the new detector are given.
Citation: Review of Scientific Instruments
Volume: 60
Issue: 1
Pages: pp. 1 - 11
Research Areas: Instrumentation