Beam Alignment Method and Electron Microscope
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Abstract
There is provided a beam alignment method capable of easily aligning an electron beam with a coma-free axis in an electron microscope. The method starts with tilting the electron beam (EB) in a first direction (+X) relative to a reference axis (A) and obtaining a first TEM (transmission electron microscope) image. Then, the beam is tilted in a second direction (−X) relative to the reference axis, the second direction (−X) being on the opposite side of the reference axis (A) from the first direction (+X), and a second TEM image is obtained. The reference axis is incrementally varied so as to reduce the brightness of the differential image between a power spectrum of the first TEM image and a power spectrum of the second TEM image.
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Citations
7 Claims
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The. The invention claimed is:
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1. A beam alignment method of aligning the direction of incidence of an electron beam with a coma-free axis in an electron microscope, said method comprising the steps of:
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tilting the electron beam in a first direction relative to a reference axis and obtaining a first TEM (transmission electron microscope) image; tilting the electron beam in a second direction relative to the reference axis, the second direction being on the opposite side of the reference axis from the first direction, and obtaining a second TEM image; and modifying the reference axis in such a way as to reduce the brightness of a differential image between a power spectrum of the first TEM image and a power spectrum of the second TEM image. - View Dependent Claims (2)
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3. An electron microscope comprising:
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a deflector for deflecting an electron beam to vary the direction of incidence of the electron beam relative to a sample; a deflector controller for performing a first operation, in which the deflector is controlled such that the electron beam is tilted in a first direction relative to a reference axis, and a second operation, in which the deflector is controlled such that the electron beam is tilted in a second direction relative to the reference axis, the second direction being on the opposite side of the reference axis from the first direction; a TEM image acquisition portion for obtaining a first TEM image and a second TEM image when the electron beam is tilted in the first direction and in the second direction, respectively; a differential image generator for generating a differential image between a power spectrum of the first TEM image and a power spectrum of the second TEM image; and a display controller for providing control to display the differential image on a display device. - View Dependent Claims (4, 5, 6, 7)
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Specification