| Author(s): |
M Scheinfein; Daniel T. Pierce; John 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 |
