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Describe, using equations, if appropriate, the compromises you will make when you change the aperture half...

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Physics

Describe, using equations, if appropriate, the compromises youwill make when you change the aperture half angle in an SEM. Youshould discuss the signal intensity, the depth of field,aberrations and the resolution.

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On decreasing the diameter of the aperture will decrease lens aberrations and thus increase resolution decrease the probe current decrease the convergence angle of the beam and thus increase the depth of focus Resolution is the minimum spacing at which two features of the specimen can be recognized as distinct or separate In order to obtain highresolution images we need to adjust the probe diameter to e scale of interest and ensure that a minimum level of contrast exists with the    See Answer
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