Patent ID: 9390888
Filing Date: 2016-07-12
CPC Classification: G01N,H01J

Claim Text:
1. A high angular resolution electron scattering apparatus for characterizing surface features in nanometers from a sample in either a reflection mode, or a backscattering mode or both, wherein the sample comprises an opaque substrate which is made of materials with a thickness that is impenetrable by electrons in KeV ranges, and the sample has a diameter of up to 40 cm or larger, the electron scattering apparatus comprising: a sample stage configured to hold the sample; an electron source configured to produce an electron beam; a plurality of electron collimation optics configured to receive the electron beam from the electron source and direct the electron beam to the sample stage; a plurality of electron projection optics; and an electron detector module, wherein the electron projection optics are configured to receive scattered/reflected electrons from the sample and direct the scattered electrons to the electron detector module, wherein a value of effective distance from the sample to the electron detector module is up to about 100 meters or more; wherein angular resolution is in a range from about 10