Patent ID: 7262410
Filing Date: 2007-08-28
Classification: G01N,H01J

Abstract:
1. A sample observing apparatus for observing the surface of a sample by irradiating an electron beam, comprising: an electron gun for irradiating the electron beam to the surface of said sample; a potential control section for adjusting electric potential of the surface of said sample to potential set in advance by applying voltage based on an amount of electric charge on the surface of said sample to said sample; an electron detecting section for detecting electrons produced when the electron beam is irradiated to the surface of said sample; an appearance acquiring section for acquiring the appearance of surface of said sample per each spot on the surface based on the electrons detected by said electron detecting section; and an energy filter for selectively sorting reflected electrons and secondary electrons from electrons produced when said electron beam is irradiated to the surface of said sample and supplying them to said electron detecting section, wherein the reflected electrons have energy higher than a predetermined value and secondary electrons have energy less than that of said reflected electrons.