Help with my Workshop its analytical chemistry related Answer ALL parts a) - c).
a) The scanning electron microscope typically uses two imaging modes, secondary electron
imaging and backscattered electron imaging. Describe the difference between the two
imaging modes, including the process generating these electrons, the kinetic energies of
the electrons and the features of a sample you can observe in each mode.
b) What are the respective approximate resolutions of secondary electron and backscattered
imaging for bulk samples?
c) If the aperture in an SEM subtends a semi-angle of 2mrad and the pixel size in the image
is 100nm, what is the depth of field of this image?
Answer ALL parts a) - c).
a) The scanning electron microscope typically uses two imaging modes, secondary electron imaging and backscattered electron imaging.Describe the difference between the two imaging modes, including the process generating these electrons, the kinetic energies of the electrons and the features of a sample you can observe in each mode. [6]
b) What are the respective approximate resolutions of secondary electron and backscattered imaging for bulk samples? [2]
c) If the aperture in an SEM subtends a semi-angle of 2 mrad and the pixel size in the image is 100 nm, what is the depth of field of this image? [2]