SEM lab week

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SEM lab week 8 1999 Effects of
Accelerating Voltage
These images and the following 2 are of a
Cu-Alumina interface at different voltages
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(No Transcript)
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Images here were collected of alumina and copper
where half of the sample is gold coated. As
voltage decreases, the atomic number of the Au
coating dominates.
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The following series of 4 images shows the effect
of voltage on a foreign particle on a copper
surface which is charging. By changing the
voltage to reach the zero point of charge the
problem is eliminated. If this particle were on
the alumina surface (ZPC4kv) there would be no
voltage that would work for both.
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The following series of 4 images shows the effect
of voltage on a foreign particle on a copper
surface which is charging. By changing the
voltage to reach the zero point of charge the
problem is eliminated. If this particle were on
the alumina surface (ZPC4kv) there would be no
voltage that would work for both.
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Charging Sensitivity