More review problems for OM 13 What are differences between the common transmitted (or reflected)OM and polarized OM? 14. Can a polarized om be used to determine the orientation (or optical axis) of an anisotropic single crystal? State your reasonIng. 15. Can you see something from eyepiece lens when an isotropic crystal is on the sample stage of a polarized oM? Why or why not?
More review problems for OM 13. What are differences between the common transmitted (or reflected) OM and polarized OM? 14. Can a polarized OM be used to determine the orientation (or optical axis) of an anisotropic single crystal? State your reasoning. 15. Can you see something from eyepiece lens when an isotropic crystal is on the sample stage of a polarized OM? Why or why not?
Lecture-4 Scanning Electron Microscopy SEM) e What is SEM? Working principles of SEM Major components and their functions Electron beam -specimen interactions Interaction volume and escape volume Magnification resolution depth of field and image contrast Energy dispersive x-ray spectroscopy(EDS) Wavelength dispersive X-ray spectroscopy(Wds) Orientation Imaging Microscopy(OIM) X-ray fluorescence(Xre) http://www.mse.iastate.edu/microscopy http://www.youtube.com/watch?v=kynknr-e5iuto2:40inTroduction http://virtual.itg.uiucedu/training/em_tutoria http://science.howstuffworkscom/scanning-electron-microscope.htm/printable
Lecture-4 Scanning Electron Microscopy • What is SEM? • Working principles of SEM • Major components and their functions • Electron beam - specimen interactions • Interaction volume and escape volume • Magnification, resolution, depth of field and image contrast • Energy Dispersive X-ray Spectroscopy (EDS) • Wavelength Dispersive X-ray Spectroscopy (WDS) • Orientation Imaging Microscopy (OIM) • X-ray Fluorescence (XRF) http://www.mse.iastate.edu/microscopy http://www.youtube.com/watch?v=KYNknR-e5IU to 2:40 Introduction http://virtual.itg.uiuc.edu/training/EM_tutorial http://science.howstuffworks.com/scanning-electron-microscope.htm/printable (SEM)
Comparison of OM, TEM and sEM Probe "Source of Hight source e| ectrons一 -Condenser a magnetic lenses Specimen中 beam defacto objective Projector Specimen Eyepiece CRT Cathode Ray tube / IMAGE VIENED IMAGE ON detector DIRECTLY FL UORESCENT OM TEM SEM LIGHT MCROSCOPE Electronics ELECTRON MICROSCOPE ELECTRON MIC ROSCOPE Principal features of an optical microscope, a transmission electron microscope and a scanning electron microscope, drawn to emphasize the similarities of overall design https://www.youtube.com/watch?v=b4wosyktdn4comparingmicroscopesto0:12
Principal features of an optical microscope, a transmission electron microscope and a scanning electron microscope, drawn to emphasize the similarities of overall design. Comparison of OM,TEM and SEM OM TEM SEM Magnetic lenses detector CRT Cathode Ray Tube Light source Source of electrons Condenser Specimen Objective Eyepiece Projector Specimen https://www.youtube.com/watch?v=b4WOsYktdn4 comparing microscopes to 0:12 Probe
Optical Microscopy(OM)Vs Scanning Electron Microscopy (SEM) 25 radiolarian OM SEM Small depth of field Large depth of field Low resolution High resolution
Optical Microscopy (OM ) vs Scanning Electron Microscopy (SEM) 25mm OM SEM Small depth of field Low resolution Large depth of field High resolution radiolarian
What is SEM http://virtual.itguiucedu/training/em_tutorial Column SEM is designed for direct studying of of the surfaces of solid objects Sample ESEM Chamber □ XL30 ESEM-FEG Scanning electron microscope (SEM) is a microscope that uses electrons rather than light to form an image. There are many advantages to using the SEM instead of a OM https://www.youtube.com/watch?v=sfsfpxdaiam http://www.youtube.com/watch?v=irxmighanbgHowaSemworksw1:20-2:10 http://www.youtubecom/watch?v=saavaiLuobgOperationofSem
What is SEM Scanning electron microscope (SEM) is a microscope that uses electrons rather than light to form an image. There are many advantages to using the SEM instead of a OM. https://www.youtube.com/watch?v=sFSFpXdAiAM http://www.youtube.com/watch?v=lrXMIghANbg How a SEM works ~1:20-2:10 http://www.youtube.com/watch?v=SaaVaILUObg Operation of SEM Sample Chamber Column http://virtual.itg.uiuc.edu/training/EM_tutorial SEM is designed for direct studying of the surfaces of solid objects