透射电镜tem必学超经典课程做计算找华算lecture the instrument microscope columnpart.pdf

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“Theinstrument”Lecture4ReviewofimagingmodesSystemoverviewReviewofimagingmodes–Condensersystem–Objectivelens&samplestage–Formingimagesanddiffractionpatterns•TEMmode•STEMmodeMicroscopealignment–Philosophy–Step-by-stepCalibrations–Magnification,cameralength,rotation(ifneeded),convergenceangleTEMoverviewTEMcrosssectionElectronGunCondenserSystemObjectiveSystemProjectorSystemTEMcrosssection(simplified-somewhat)ElectronGunCondenserSystemObjectiveSystemProjectorSystemTEMcrosssectionSourceElectronWehneltcupgunGundeflectorsCondenserC1“SpotSize”systemC2“Brightness”C3“Convergence”CApertureCStigmatorsBeamdeflectors/scancoilsObjectiveObjectivelenssystemSampleObjapertureObjstigmatorSelectedAreaapt.Intermediate1IntermediateIntermediate2systemIntermediate3ProjectorCondensersystemGoal:placethebeamonthes

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