Spherical micro-hole grid for high-resolution retarding field analyzer
Takayuki Muro, T. Matsushita, Kazumi Sawamura, Jun Mizuno
Abstract
A wide-acceptance-angle spherical grid composed of numerous micro cylindrical holes was developed to be used for the retarding grid of a display-type retarding field analyzer (RFA) and to enhance the energy resolution ( E /Δ E ). Each cylindrical hole with a diameter of 50 µm and a depth of 80 µm is directed to the spherical center. The inner radius of the spherical grid is 40 mm. The holed area corresponds to an acceptance angle of ±52°. The E /Δ E of an RFA equipped with the developed holed grid was estimated to be 2000 from a measured Au 4 f photoemission spectrum. A clear photoelectron hologram was observed in the Mo 4 p core-level region of MoS 2 , indicating that the RFA with the holed grid is effective for photoelectron holography.