Patent ID: 7928376

Claim:
A scanning transmission electron microscope comprising: an electron beam source to generate electron beams; a scanning section to scan the electron beam; objective lens to converge the electron beam onto a specimen; an electron spectrometer that analyzes into spectrum the energy of the electron beam transmitted through the specimen, the electron spectrometer having an accelerating tube to accelerate the electron beam; a plurality of electron beam detectors that are capable of a simultaneous measuring of at least two energy ranges of spectra for the electron beam that lost specific energy; a storage device which stores acceleration voltage data and window information for different elements to be analyzed; an input device to select a measurement region and an element to be analyzed; and a control unit that controls the accelerating tube so that the electron beam, which has lost specific energy corresponding to a selected element to be analyzed, enters into a fixed position in the electron beam detectors, based on the data stored in the storage device; and detects the selected element to be analyzed on the basis of the intensity of the electron beam within a predetermined energy range out of those electron beam intensities detected above; distribution images of different elements being obtained by switching objective elements at a same measurement region during observation of one specimen.