Patent ID: 8263934
Filing Date: 2012-09-11
Classification: G01N,G01R,H01J

Abstract:
1. A method for detecting information of an electric potential on a sample, the method comprising calculating the information relating to the electric potential on the sample based on: (i) information obtained based on charged particles detected when a magnitude of a negative voltage applied to the sample is higher than an acceleration voltage applied for accelerating a charged particle beam toward the sample in a state in which the charged particle beam is applied from a charged particle source toward the sample, wherein the information obtained based on the charged particles detected includes at least one of (1) a detected position of an electron reflected by the electric potential on the sample, (2) a position, an area, a rotation angle or a brightness of a structure of an electron microscope, wherein the structure is included in an image formed based on the electrons reflected by the electric potential on the sample, or (3) a blurring, a magnification or a distortion of the image, and (ii) a correlation between the information obtained based on the charged particles detected and the information relating to the electric potential on the sample, wherein the correlation is obtained in advance.