Patent ID: 7067805

Claim:
An electron beam energy loss spectrum measuring apparatus comprising: an electron beam detector including multiple pixels, and for measuring a spectrum of an electron beam transmitted through a specimen; an energy filter controller for controlling the position of said electron beam coming into said electron beam detector, an operation unit, and a central controller for controlling said energy filter controller and said operation unit; a lens for adjusting a focus of an electron beam energy loss spectrum; and a controller for controlling a peak where an electron beam intensity is at a maximum in an electron beam energy loss spectrum, and for controlling such that a full-width of the peak at a half-maximum of the peak is at a minimum and/or a peak intensity is at a maximum; wherein the position of a peak appearing on a spectrum detected by said electron beam detector is detected as a peak pixel position of said electron beam detector, a position deviation value between a reference pixel position designated as a reference position on said electron beam detector and said peak pixel position is detected, said position deviation value is converted into a control factor for controlling the position of said electron beam, and said position deviation value is corrected based on said control factor.