Effects of hydrogen adsorption on the performance of the W(001) spin-polarized low-energy electron diffraction electron polarimeter

Since hydrogen is the main residual gas in a metal ultrahigh vacuum chamber, the effect of hydrogen adsorption on the performance of an electron polarimeter based on spin-polarized low-energy electron diffraction (SPLEED) from the W(001) surface, has been investigated experimentally. The experiments involved both dosing the analyzer crystal to calibrated coverages of hydrogen, and allowing residual gas in the vacuum chamber to adsorb on the …