Patent ID: 8071942
Filing Date: 2011-12-06
Classification: H01J

Abstract:
1. A sample holder apparatus for reducing the energy of charged particles entering an annular-acceptance analyzer, the apparatus comprising: an electrically isolated sample support member having a sample receiving surface to receive a sample and electrically connect the sample to the sample support member, wherein the sample support member is configured for application of a retarding bias potential; and a grounded sample aperture member defining an aperture, wherein the grounded sample aperture member is positioned relative to the sample support member but electrically isolated therefrom such that the aperture is proximate the sample receiving surface to expose at least a portion of a surface of a sample received thereon to be analyzed, wherein the grounded sample aperture member along with the sample support member produce an electrical retarding field about the aperture when a retarding bias potential is applied thereto that reduces the energy of emitted particles from a sample before they enter the annular-acceptance analyzer.